Answer:
cut down on fossil fuels and green house gasses
Explanation:
they are thickening the atmosphere so when the Suns rays enter earth they can't escape
North Africa was important to the invaders because of the food and trade source. The correct option among all the options given in the question is option "B". North Africa was a valuable trade route for slaves and exchanging salts and gold. This importance of the trade route attracted many invaders to invade North Africa.