Also, explain to this Canadian why NASA is researching climate. Isn't NOAA supposed to be the agency for that? Isn't it National Aeronautics and Space Administration, responsible for air and space flight, not everything under the sun?
NASA's mission includes increasing our understanding of stuff in space. That includes studying the sun, the planets, moons and anything else in the solar system and beyond it. Not only is NASA responsible for everything under the sun, but everything beyond it as well. This doesn't change just because we happen to live on one planet. Through the EOS program, NASA funds quite a bit of research for better understanding the Earth and the processes occurring here. Climate change would fall under that category and is one of the more high profile areas.