Many climate change naysayers make the obvious mistake equating weather to climate.

There's weather:
weather (n) - the state of the atmosphere with respect to wind, temperature, cloudiness, moisture, pressure, etc.
For instance: a strong wind or storm or strong winds and storms collectively: We've had some real weather this spring.

Then there's climate:
climate (n) - the composite or generally prevailing weather conditions of a region, as temperature, air pressure, humidity, precipitation, sunshine, cloudiness, and winds, throughout the year, averaged over a series of years.
Then, there's this fun little graphic:

So if it's cold today in Topeka in January, does that mean there is no "global warming"? If you're an apologist for the oil/coal industries and/or believe Fox News/Drudge and the legion of GOP college dropout puppets, you are a sucker confusing weather with climate.
So whenever someone chuckles about cold weather happening and mention how Al Gore is wrong,
just assume that person is mixing up "climate" with "weather".
Then there is also a growing concern that the warming of the planet could actually lead to a new Ice Age:

...the ice records show repeated patterns of sudden warming, called Dansgaard-Oeschger cycles, when temperatures in Greenland rose by five to 10 degrees Celsius over a few decades.
Those cycles were matched by rapid changes in surface-water salinity in the north Atlantic, the researchers found. The Atlantic got saltier during cold periods, and fresher during warm intervals. The freshening likely reflects shifts in rainfall patterns, mostly in the tropics, Spero said.
"Suddenly, we're looking at a record that links moisture balance in the tropics to climate change," he said.
Close to the tropics, warm, moist air forms a zone of heavy tropical rainfall, called the Intertropical Convergence Zone, which dilutes the salty ocean with fresh water. Today, the tropical rainfall zone reaches into the northern Caribbean, but during the colder periods of the ice age it was pushed much farther south, toward Brazil. That kept fresh water out of the northern Atlantic, so it became more salty, Spero said.
http://www.sciencedaily.com/releases/2006/10/061004180029.htmBack to that term "global warming". It is a term that gets used by climate change naysayers "proving" it doesn't exist if some town has a snowstorm last Thursday.
Does global warming exist, even if there was a snow storm in Peoria last Wednesday? Remember the 2004 film
The Day After Tomorrow? Entertaining stuff, but then there's actual science...
Here is an incredible resource with some basic facts:
- Average temperatures have climbed 1.4 degrees Fahrenheit (0.8 degree Celsius) around the world since 1880, much of this in recent decades, according to NASA's Goddard Institute for Space Studies.
- The rate of warming is increasing. The 20th century's last two decades were the hottest in 400 years and possibly the warmest for several millennia, according to a number of climate studies. And the United Nations' Intergovernmental Panel on Climate Change (IPCC) reports that 11 of the past 12 years are among the dozen warmest since 1850.
- The Arctic is feeling the effects the most. Average temperatures in Alaska, western Canada, and eastern Russia have risen at twice the global average, according to the multinational Arctic Climate Impact Assessment report compiled between 2000 and 2004.
- Arctic ice is rapidly disappearing, and the region may have its first completely ice-free summer by 2040 or earlier. Polar bears and indigenous cultures are already suffering from the sea-ice loss.
- Glaciers and mountain snows are rapidly melting—for example, Montana's Glacier National Park now has only 27 glaciers, versus 150 in 1910. In the Northern Hemisphere, thaws also come a week earlier in spring and freezes begin a week later.
- Coral reefs, which are highly sensitive to small changes in water temperature, suffered the worst bleaching—or die-off in response to stress—ever recorded in 1998, with some areas seeing bleach rates of 70 percent. Experts expect these sorts of events to increase in frequency and intensity in the next 50 years as sea temperatures rise.
- An upsurge in the amount of extreme weather events, such as wildfires, heat waves, and strong tropical storms, is also attributed in part to climate change by some experts.
http://news.nationalgeographic.com/news/2004/12/1206_041206_global_warming.html
NASA has an incredible site on many levels of evidence of climate change. There's college dropout knuckleheads like Sean Hannity and Glenn Beck saying there is no climate change. Then there are things called satellites, science, scientists and verifiable proof. They also make some nice graphics:

Arctic sea ice reaches its minimum extent each September. The graph on the left charts the average September extent from 1979 to 2009, derived from satellite observations. The illustration on the right shows the Arctic sea ice minimum extent for 2009, which was the third-lowest in the satellite record.

The chart on the left shows historical sea level data derived from coastal tide gauge records. The chart on the right shows the average sea level since 1993 derived from global satellite measurements, updated here monthly. Sea level rise is associated with the thermal expansion of sea water due to climate warming and widespread melting of land ice.

The time series shows the combined global land and marine surface temperature record from 1850 to 2008. The year 2008 was tenth warmest on record, exceeded by 1998, 2005, 2003, 2002, 2004, 2006, 2001, 2007 and 1997.

The "ozone hole" is a severe depletion of the ozone layer high above Antarctica. It is primarily caused by human-produced compounds that release chlorine and bromine gases in the stratosphere. The ozone layer acts to protect life on Earth by blocking harmful ultraviolet rays from the sun.
The image is a view of the most recent Antarctic ozone hole, derived from satellite measurements that monitor the ozone layer. The blue and purple colors are where there is the least ozone, and the greens, yellows, and reds are where more ozone is present.
Source:
http://climate.nasa.govOf course, the United Nations' Intergovernmental Panel on Climate Change has some very good information on climate change. Presentations in PDF and webcast format are available:
http://www.ipcc.ch/presentations_and_speeches/presentations_and_speeches_presentations.htmA great site "Climate Analysis Indicators Tool" (
http://cait.wri.org/figures.php) offers a lot of info on scientific basis of climate change.
Another incredible resource for many issues besides global warming/climate change is the Union of Concerned Scientists web site (
http://www.ucsusa.org/global_warming/). Besides an incredible volume of information and other content, the site tackles the so-called "ClimateGate" misinformation drummed up by the Usual Right Wing Suspects and thouroughly debunks the nonsense:
While the emails have raised some concerns, the email content being quoted does not indicate that climate data and research have been compromised. Most importantly, nothing in the content of these stolen emails has any impact on our overall understanding that human activities are driving dangerous levels of global warming. Media reports and contrarian claims that they do are inaccurate.
(snip)
Much has been made about emails regarding a certain paper that some scientists did not think should have been published in a peer-reviewed academic journal. These emails focus on a paper on solar variability in the climate over time. It was published in a peer-reviewed journal called Climate Research, but under unusual circumstances. Half of the editorial board of Climate Research resigned in protest against what they felt was a failure of the peer review process. The paper, which argued that current warming was unexceptional, was disputed by scientists whose work was cited in the paper. Many subsequent publications set the record straight, which demonstrates how the peer review process over time tends to correct such lapses. Scientists later discovered that the paper was funded by the American Petroleum Institute.
http://www.ucsusa.org/global_warming/science_and_impacts/global_warming_contrarians/debunking-misinformation-stolen-emails-climategate.htmlHere's a partial list of organizations that support the notion that climate change is indeed a problem:
InterAcademy Council
European Academy of Sciences and Arts
International Council of Academies of Engineering and Technological Sciences
Network of African Science Academies
Royal Society of New Zealand
Polish Academy of Sciences
National Research Council (US)
American Association for the Advancement of Science
American Chemical Society
American Institute of Physics
American Physical Society
European Science Foundation
Federation of Australian Scientific and Technological Societies
American Geophysical Union
European Federation of Geologists
European Geosciences Union
Geological Society of America
Geological Society of Australia
International Union of Geodesy and Geophysics
National Association of Geoscience Teachers
American Meteorological Society
Australian Meteorological and Oceanographic Society
Canadian Foundation for Climate and Atmospheric Sciences
Canadian Meteorological and Oceanographic Society
Royal Meteorological Society (UK)
World Meteorological Organization
American Quaternary Association
International Union for Quaternary Research
American Association of Wildlife Veterinarians
NASA
American Society for Microbiology
Australian Coral Reef Society
Institute of Biology (UK)
Society of American Foresters
The Wildlife Society (international)
American Academy of Pediatrics
American College of Preventive Medicine
American Medical Association
American Public Health Association
Australian Medical Association
World Federation of Public Health Associations
World Health Organization
American Astronomical Society
American Statistical Association
Engineers Australia (The Institution of Engineers Australia)
International Association for Great Lakes Research
American Association for the Advancement of Science
Source:
http://en.wikipedia.org/wiki/Scientific_opinion_on_climate_changeIf you want to check out the Climate Change skeptics, a wonderful site has them in the crosshairs. Here's a portion:
Ian Plimer, a Professor of Mining Geology at the University of Adelaide, South Australia, is the author of Heaven and Earth, a book hailed by climate change skeptics. Plimer is also a director of three mining companies: Ivanhoe Australia, a subsidiary of Bob Friedland's Ivanhoe Mines, CBH Resources and Kefi Minerals.
Patrick J. Michaels is the Editor of the World Climate Report, a blog published by New Hope Environmental Services, "an advocacy science consulting firm" he founded and runs. Michaels, who is considered to be one of the leading global warming skeptics, has long been a speaker to various think tanks, trade associations and energy and other companies. On a 2007 academic CV, Michaels disclosed that prior to creating New Hope Environmental Services he had received funding from the Edison Electric Institute and the Western Fuels Association.
http://www.sourcewatch.org/index.php?title=Portal:Climate_Change/div]
Just for giggles, look at the list of industry-funded groups and think tanks who you're likely to see pimping the idea that global warming/climate change doesn't exist because it's cold in Britain:
Go here for even more info, download the book:
http://www.aip.org/history/climate/
Of course, there's this site:
http://www.climatecrisis.net/