There are 7.7 billion humans on Earth today. Here's what would actually happen if Thanos destroyed 50% of all life on the planet.

What if Thanos really had wiped out 50 percent of all life on Earth? To be fair, Thanos has good intentions: To help improve the quality of life for everyone left. But it turns out, ecosystems don’t work that way. Here's why Thanos' plan is a terrible idea that would doom all life on Earth.