On the contrary, one of the biggest problems the world will face over the next few years, is population collapse. Fertility rates are dropping dramatically in the developed world. We are likely to see peak population in 2070, when the global fertility rate will fall below the global replacement fertility rate, we will not have enough young workers to support an aging population, we already see this in Japan and parts of Europe, but due to the one child policy we will soon see this in China too.
Good for the environment, maybe...but it may result in very unfavourable social and economic consequences.