Ddt was a highly effective insecticide developed in the 1940's. ddt was so good at killing mosquitoes and as a result, reducing malaria, that its inventor, paul muller, won the nobel prize.
but in the 1960's it was discovered that ddt is taken up by algae in the water, increasing in concentration at each step of the food chain. this increase in concentration in the tissues of higher-level consumers is referred to as biomagnification. it was shown that this process resulted in the extinction of or near extinction of several predatory bird species. as a result of biomagnification, ddt was banned for agricultural use worldwide under the stockholm convention, although its limited use in disease vector control continues to this day and remains controversial.

banning the use of ddt as an agricultural pesticide is based on the evidence in the passage that states