Drought in the Rio Grande do Sul part of Brazil is the worst in 40 years, and some scientists suspect rising sea temperatures to be the cause. The cost to agriculture could measure in the billions, according to local news reports. Photo credit: © Greenpeace / Daniel Beltra
There are many things you can do to help slow anthropogenic climate change, which is caused by emissions of greenhouse gases such as carbon dioxide. A few small changes can make a big difference (such as changing a light bulb).
New York Times writer Andrew Postman discovered some easy ways to reduce his carbon output when he put his family on an energy diet.
You can also write your congressperson and encourage support of legislation that reduces carbon emissions. Many websites have pre-written letters you can send. Here's an example of one.
One of the biggest things you can do is stay informed. Many news outlets such as BBC News have special sections that explain climate change.
Also there is information on the politics of climate change at United Nations Framework Convention on Climate Change.
RealClimate is a climate science blog by climate scientists for the interested public and journalists. They aim to provide a quick response to developing stories and provide the context sometimes missing in mainstream commentary.