This report says that Eric R. Pianka, a prestigious research ecologist, advocates releasing the Ebola virus to eliminate 90% of human beings and thus save the Earth. I offer an alternative method to cleanse the world of humans. Let's raise the income tax to 99%.
I admit that Pianka's proposal has an advantage over mine. Once we achieve the 90% extermination goal, stopping the Ebola epidemic may prove easier than convincing governments to cut back the tax rate.