GREENHOUSE EFFECT.

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Presentation transcript:

GREENHOUSE EFFECT

definition Sun’s rays are trapped by greenhouse gases in troposphere Heat is trapped like a greenhouse

Is this bad? Need greenhouse effect to warm earth But… Too much heat creates global warming

EARTH Without Greenhouse Effect: 32º F With Greenhouse Effect: 57 º F Mars- too little Venus- too much

Enhanced Greenhouse Effect Human contribution to Greenhouse Gases

GHG Greenhouse gas Any gas the traps in heat Examples: Water vapor methane (CH4) CO2 nitrous oxide (Nox)

Greenhouse gas producers

GWP- global warming potential relative measure of how much heat a greenhouse gas traps in the atmosphere. Compared to CO2

Fossil fuels? Coal Oil (petroleum) Natural gas electricity Gasoline plastics Natural gas heating

Why are fossil fuels “bad”? Produce carbon dioxide

Are we warming?

Rising sea level by 2080 (projected)

Earth’s climate has always been changing 7/19/2018

PALEOCLIMATES Ancient climates 7/19/2018

How do we study past climates??? 7/19/2018

Fossils- to tell climate millions of years ago Certain critters only live in WARM climates Trilobites Corals (Petoskey stones) dinosaurs 7/19/2018

Ice cores- to tell climate 100,000+ years ago Ancient air bubbles are trapped in the ice Can analyze ancient air, look at CO2! 18O/16O- seen in actual ice More 18O in ice than 16O= hotter Tells ancient temp. 7/19/2018

7/19/2018

Tree rings- tell climate hundreds of years ago Wider rings represent warm wet climate 7/19/2018

Jan. 10, 2017