ent Spring I. iscuss Issues On Environment 1. What do you know about environmental pollution? Pollution refers primarily to the fouling of air, water For reference and land by wastes. Thus litter, billboards, and auto junkyards are said to constitute visual pollution; noise excessive enough to cause psychological or physical damage is considered noise pollution and waste heat that alters local climate or affects fish populations in rivers is designated thermal pollution The 20th century has seen pollution approach crisis proportions throughout the world W B T LE To be continued on the next page.W B T L E Lesson 11 – Silent Spring I. Discuss Issues On Environment For reference To be continued on the next page. 1. What do you know about environmental pollution? Pollution refers primarily to the fouling of air, water, and land by wastes. Thus litter, billboards, and auto junkyards are said to constitute visual pollution; noise excessive enough to cause psychological or physical damage is considered noise pollution; and waste heat that alters local climate or affects fish populations in rivers is designated thermal pollution. The 20th century has seen pollution approach crisis proportions throughout the world