The political idea held by many radicals within organizations like PETA and Green Peace that we need to work for the end of the human race. The steady attrition of humanity. The world returns to a state of nature, the balance returns.
Typical elements of the Extinctionism agenda include regulated family size, maximum birth control, maximum abortion; easy access to painless death for all who want out and veganism in the meantime. Paradise is achieved. No more human dreams. No more art or poetry. No faith, hope or love, just an environmental laboratory without scientists.