In a 2005 speech, British Prime Minister Tony Blair said: "Global warming is too serious to ignore its danger or split into opposing factions on it." And yet, seven years later, there are still many who not only continue to ignore climate change but who also express conspiracy theories about the entire concept.

In honor of the arrival of spring and this winter's record-setting temperatures, here is the evidence that global warming is real and the conspiracy theories that insist it isn't.