What cause-and-effect relationship is described in this article?

Question

Deforestation in Kenya led to environmental degradation.
Tossing away unsold food in California led to a decrease in methane.
Tossing away unsold food in California led to more trees being planted.
Deforestation in Kenya led to new sources of drinking water.

Answer 1

The cause-and-effect relationship described in this article is:

Deforestation in Kenya led to environmental degradation.