ABC Environment 8 AUG 2012; Michael Mann
THE FIRST SCIENTIST to alert Americans to the prospect that human-caused climate change and global warming was already upon us was NASA climatologist James Hansen. In a sweltering US Senate hall during the hot, dry summer of 1988, Hansen announced “it is time to stop waffling… The evidence is pretty strong that the [human-amplified] greenhouse effect is here.”
At the time, many scientists felt his announcement to be premature. I was among them.
I was a young graduate student researching the importance of natural — rather than human-caused — variations in temperature, and I felt that the ‘signal’ of human-caused climate change had not yet emerged from the ‘noise’ of natural, long-term climate variation. As I discuss in my book,The Hockey Stick and the Climate Wars, scientists by their very nature tend to be conservative, even reticent, when it comes to discussing findings and observations that lie at the forefront of our understanding and that aren’t yet part of the ‘accepted’ body of scientific knowledge. Continue reading →