Greenhouse gases and Climate change

Question 1

How does human activity affect composition of air?

Answer 1

more ppl = more respiring=more co2
more energy lighting,cooking etc
countries becoming industrialised = more energy demand per person -more electrical devices
energy comes from burning fossil fuels which all release more co2

Question 2

What is a greenhouse gas?

Why do we need greeehouse gases?

Answer 2

gases in atmosphere that can absorb and reflect heat radiation.Present in small amounts co2,water vapour and methane .To keep the earth warm enough to live on

Question 3

Definition of climate change

Answer 3

a rise in temperature(warming of earth) due to increased carbon dioxide(ghouse gases) in the atmosphere. Destroys habitats of polar bears and flooding.

Question 4

State 2 ways to reduce co2

Answer 4

seeding oceans with iron compounds .Might encourage microscopic plants to grow which could use carbon in photosynthesis .Carbon eventually would incorporated
into shells and end up in sediments
use less fossil fuels-walking ,cycling ,turning central heating down
capturing co2 from power station waste gas and converting it into hydrocarbons to be used as fuels