On the 20th anniversary of the graph that galvanized climate action, it is time to speak out boldly
Some links are indisputable; others are more subtle, but the science is improving all the time
The new administration could cut greenhouse gases and achieve its economic goals all at once
Donald Trump should pursue climate action to achieve his own economic, jobs and competitiveness goals
The world can still avoid dangerous global warming if it acts fast
Emitting carbon dioxide at current rates will soon push Earth’s temperature up by 2 degrees Celsius. Here’s how to make the calculation yourself
The rate of global temperature rise mayhave hit a plateau, but a climate crisis still looms in the near future
Editor's note: The following is a response by climatologist Michael E. Mann to a Q&A article that appeared in the June 2011 issue of Scientific American , which became available to readers in May.