In 1972 and 2002, Canada and the U. S. agreed to take action regarding what kind of pollution?

A)acid rain
B)canadian shield pollution
C)deforestation
D)great lakes pollution

- world peace, cause that's important

- iron man to still be alive, cause i cried my eyes out

- for those in starving places like africa to get the support that they need for food and water, cause they r humans and need those basic things go be alive.

answer; ///i believe the correct answer is (b) the writing of the ancients who lived in india after the indus valley inhabitants died out;