Now or later?

I wonder which is costlier... The price of setting up clean and green sources of energy and practicing laws to ensure that pollution levels are low or the cost of not doing that, but restoring and trying to revive the species that are nearing extinction, threatening the balance of nature... I guess eventually, cost of the latter will shoot up as nature becomes more and more unbalanced, more efforts will be required to restore it...

Numbers!

Let this freak you out

http://www.worldometers.info/