In San Diego, why is it that most south facing mountain slopes will have vegetation that is sparse relative to the lush north facing slopes?

Answer herbicide-resistant soybeans;

Dis the answer you perception is how you see the world 

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city.