The climate can change naturally, such as how the Sahara was tropical 10,000 years ago and is a desert today. Modern science suggests that ___________
can also contribute to increase _________of climate change, due to human_____________ advances.
The covering of much of the Sahara desert by grasses, trees and lakes was caused bychanges in Earth's orbit around the Sun;changes in vegetation and dust in the Saharawhich strengthened the African monsoon; and increased greenhouse gases, which may imply that anthropogenic global warming could result in a shrinkage ...
