James Hansen is the NASA scientist who twenty years ago warned the US Government about the reality of, and the dangers in climate change. In 1988, during what was then a record year of high temperatures (a record repeatedly exceeded since), Hansen testified before Congress and called for urgent action to reduce greenhouse gas (GHG) emissions.
Two decades later Hansen has again appeared before US Congress to say that we have long since passed the "dangerous level" for atmospheric GHG levels. In short, we need to get back to 1988 levels in order to survive. Hansen is a man to be listened to. He is the director of the Goddard Institute of Space Sciences, and has been "popularly" referred to as "the godfather of global warming science" - though his message is by no means popular with many who hear it.
Hansen's warning underscores the fact that energy efficiency, while being desirable and laudable, is not going to get us to where we need to be. Only transformational change, in societal structure (and therefore living and working lives) will drive GHG levels down to sustainable (and survivable) levels. In the technology industry, a reduced energy usage per computing task is only any good as long as the resultant efficiency is not simply burned doing more "business as usual" computing work. In transport, energy efficient vehicles are only any good if we don't use them to drive further. The list goes on.This is the difficult part for us all. Energy efficient light bulbs do not cast a comforting light on the real task facing us. The simple changes are 95% comforting, and only 5% effective. A building that doesn't need artificial light to be a useful structure is better. Not requiring the building at all is transformational.
As Hansen told The Associated Press; "We're toast if we don't get on a very different path. This is the last chance."

