2. Reduce your carbon footprint. Especially in developed countries, reducing the per-capita use of fossil fuels will be essential for holding climate change below lethal thresholds for many species globally. You can assess and figure out ways to lower your carbon footprint by using one of the many on-line carbon footprint calculators (like carbonfootprint.com). Even little changes like adjusting the thermostat; trip-chaining (go from one errand to the next) when you use your car for errands; recycling; and walking or biking instead of driving, when multiplied by hundreds of millions of the world's most prolific consumers, add up to huge results.