...blocking a fraction of incoming sunlight with a giant mirror in space: using genetically-engineered plants and microbes to remove atmospheric carbon dioxide and methane at a faster-than-natural rate; seeding the atmosphere with fine particles to reflect sunlight away; dumping iron into the oceans to stimulate the growth of carbon dioxide-devouring plankton; and more. None of these would be done easily, or cheaply; quite possibly, none of these could be done effectively, or without grossly negative results (for example, a too-large plankton bloom has the potential to render parts of the ocean sterile).Cascio is right to note that we should be aware of our options in the event our environment go to the shits, and he's also right to note that these interventions are radical and have the potential to be disastrous. Re-working an autonomous system like the Earth's biosphere is a task of exquisite complexity that is quite beyond our current know-how.
Which leads me to the point I wish to make.
The evidence for anthrogenic climate change is now incontrovertible, as is the realization that this is the greatest catastrophe to ever confront our species. The time to act is now. Governments need to put measures into place that will drastically reduce greenhouse gas emissions as quickly as possible.
Moreover, given all the evidence to support global warming, I believe it is time to issue a warning and a threat to all ruling politicians around the world: you will be held accountable. At this time of crisis, your inaction as elected and accountable leaders in the face of obvious looming catastrophe will be held against you.
Barring the onset of real and effective measures, once the flood waters start to rise, the mass extinctions enter into full swing, the superstorms start to hit with regularity, and diseases and famines start to ravage populations, it will be necessary to gather all former politicians to make them answer for their reckless disregard while they were in power. Inaction today is nothing less than a crime against humanity and a crime against the environment.
These days politics has mutated into a sad and pathetic game where the only thing that matters is politicking, pandering to the ruling elites, and taking advantage of the complacent masses. It’s time that politicians actually start to lead instead of worrying about their fate in the next election.
Otherwise, they’ll have to start worrying about a different kind of fate altogether.