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.

Explanation:

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 ...

how to make a simple air condition

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).