We wield an enormous influence over the world through how we choose to vote and what we choose to buy. Again, it's the power of numbers. If voters hold their leaders responsible for doing something about global warming, it will get done. If most people refuse to buy products from companies that, for example, wrap products in more plastic than necessary, pretty soon the plastic wrapping will stop.
Heatstroke: Nature in an Age of Global Warming (ed. Island Press, 2010) - ISBN: 9781597265294