Unit 4 Reading and Thinking 课件-2021-2022学年高中英语译林版（2020）选择性必修第三册

Project Providing solutions for living beyond the Earth Unit 2 Out of this world What planets do you know in the solar system? Which one can humans possibly live on in the future? Step 1 Know some basic information about Mars Step 2 Think about the challenges of living on Mars radiation increase the risks of contracting cancer and other diseases dust storms block sunlight from reaching the surface affect energy production for long periods ... Mars is a rather harsh environment  no oxygen in its atmosphere  very cold  radiation  the atmospheric pressure in a protected environment with source of oxygen Step 3 Brainstorm solutions to the challenges Build a special structure to protect us against radiation and keep inner atmospheric pressure constant Take advantage of the solar energy in the north pole Construct nulcear power stations ... Problems Solutions … … Water Food  Water mining. Create water with oxygen and hydrogen shipped from the Earth. Grow food u