Anyone with an ounce of grey matter in his/her head knows the planet is warming. The reasons behind this warming may not be fully understood (is it caused by human technological development or just part of the Earth's natural cycle of warming and cooling?); but there is no denying that the planet is getting warmer.
Politicians of a certain -- shall we say -- political affiliation have taken the stance that climate change (aka global warming) is just a trick by the other political party to save animals and kick people off their land. So back in March, with what must have been a certain amount of glee, they invited to testify at capitol hill a renowned scientist who has long argued that climate change is hooey. I wish I could have been there as this renowned scientist sat down in front of all these naysayers and began his testimony. I would have loved to see their faces as he basically said "global warming is true." That would have been a hoot.
Of course, there are people of a certain persuasion who never let facts stand in the way of their beliefs (examples of which are far too numerous to recount here); so they will surely say this renowned scientist has been paid off to lie, or drugged, or replaced by a pod person. But you, dear intelligent reader of this blog, can read the facts for yourself (not that you ever doubted climate change).
You will find an overview of the study here.
You will find a more in-depth explanation of it here.
You can visit the site of the group that did the study here.