Sophia - Environmental Science - Unit 4 Challenge 2. 1 — Climate Change Identify scientific observations that support the idea of climate change. Of the options below, which is used by scientists as evidence of man-made climate change? • a.) The growing number of endangered species • b.) The descending sea levels • c.) The melting of glaciers and polar ice caps • d.) The steep increase in the incidence and severity of skin cancer 2 — Causes of Climate Change Determine the ...