There is evidence that we are headed into what would be the planet's sixth mass extinction. It's hard to know for sure if you're in one because a mass extinction is an event where over 75 percent of the species on the planet die out over a - usually about a million-year period. The fastest it might happen is in hundreds of thousands of years.

If we lose bees, we may be looking at losing apples and oranges. We may be looking at losing a great deal of other crops, as well, and other animals that depend on those crops.

Humans have obviously contributed a great deal of carbon to the atmosphere. So we are warming the planet up.

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