Are you sitting down? Because there's some news that might shock you. A recent study published in the journal Nature Climate Change has found that the richest 10 percent of the world population are responsible for two thirds of observable climate warming since 1990. Basically: the wealthiest among us contribute nearly seven times as much to extreme climate change than the lower 90 percent. If that's not enough to have you reaching for your pitchfork, the top 1 percent contribute 20 times as much