global warming
The human race will become extinct and it wont even be our fault. The carrying capacity of the earth is estimated at only 10 billion people, and the earths projected population is supposedly meant to reach 10 billion by the year 2040.
I strongly believe mankind as we know it will not survive past 2100.
When the Lord brings it to an end I'm telling you the time is near I feel it maybe not this century or the next but it is near

