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Climate Change How it Happens and How it Affects Us PowerPoint Presentation

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naveensingh

Description : Climate change is caused by human activities, such as burning fossil fuels, deforestation, and agricultural practices, that release greenhouse gases into the atmosphere. These gases trap heat, causing the Earths temperature to rise, leading to a wide range of impacts.

Climate change affects us in many ways, including rising sea levels, more frequent and severe heatwaves, changes in precipitation patterns, and increased frequency and severity of natural disasters. These changes have significant impacts on human societies, including food and water shortages, increased risk of disease, and displacement of vulnerable populations. Addressing climate change requires urgent action to reduce greenhouse gas emissions and transition to a more sustainable future.

Published on : Apr 26, 2023
Views : 1286 | Downloads : 1

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Climate Change How it Happens and How it Affects Us Presentation Transcript

Slide 1 -

Climate Change: How it happens and how it affects us.

Slide 2 -

Outline What is climate? What makes the climate change? How has climate changed in the past? Human caused climate change: the greenhouse effect. Have we changed the climate? What will the future climate look like? How will climate change affect people?

Slide 3 -

What is climate?

Slide 4 -

Climate is an average of weather (Temperature, Rainfall...) over a “long” time (more than 2-3 weeks). weather climate (average min/max) Weather and Climate in Seattle:

Slide 5 -

What makes climate change? Changes in the sun Changes in the earth's orbit Changes in the clouds Changes in ice sheets Volcanic eruptions Changes in the gases in the atmosphere (Greenhouse effect) Internal Wiggles (for example El Nino) Some cause bigger changes, some cause small changes Some cause slower changes, some cause fast changes Some cause changes that last, some cause changes that go away fast

Slide 6 -

How has climate changed in the past? Ice Ages Big swings in climate over 100,000 yrs Occurred over last million years Advance and retreat of ice sheets We are in between ice ages right now Now 21 thousand years ago

Slide 7 -

Eocene Warm Period 50 million years ago Palm trees in Puget Sound Crocodiles in the Arctic How has climate changed in the past?

Slide 8 -

Human-Forced Climate Change Climate changes can be natural or human caused. Humans can affect the climate by changing the gases in the atmosphere. (greenhouse effect).

Slide 9 -

The Greenhouse Effect

Slide 10 -

Carbon Dioxide (CO2) is a major greenhouse gas Human burning of fossil fuels, and plants releases CO2 Human influence on climate: the greenhouse effect

Slide 11 -

Have we changed the climate? Changes in global temperature over the last 125 years

Slide 12 -

Have we changed the climate? Changes in global temperature over the last 1,000 years

Slide 13 -

Have we changed the climate? Everywhere (almost) is warming!

Slide 14 -

1928 2000 The South Cascade glacier retreated dramatically in the 20th century Courtesy of the USGS glacier group Have we changed the climate? Glaciers are retreating all over the world

Slide 15 -

Have we changed the climate? Global Climate Models Use a computer to make a “model” of the earth Tell the computer how to force the climate Use science to come up with equations at points on the earth that tell what the Temperature, Winds,.. are and how they change Change things around and see what happens!!!

Slide 16 -

Natural Climate Influence All Climate Influences Have we changed the climate? Climate models capture the last 100 year's warming only if we include the human effects

Slide 17 -

What will the future climate look like? Global warming due to greenhouse gases will continue for many years even if we stop releasing CO2 How much warming occurs depends on what societies and businesses decide about how much fuel they burn We use climate models to predict what might happen in different cases

Slide 18 -

IPCC (www.ipcc.ch) What will the future climate look like?

Slide 19 -

What will the future climate look like? Changes are greater in far north / south Changes in rain and snow are likely, but not as well understood In WA snow will melt earlier

Slide 20 -

How will climate change affect people? Understanding: Good Everywhere: Sea-level rise Ecosystem change effect on species effect on farming Melting of polar ice effect on shipping effect on wildlife Coral death WA: Less mountain snow Less water to go around in the summer Coastal flooding (Olympia) Harder for Salmon to survive in freshwater

Slide 21 -

US Geological Survey How will climate change affect people? Understanding: Medium Everywhere: Increase in intensity of hurricanes Increase in droughts in some places Increase in intense rain in some places WA: Changes in how well forests grow Increased habitat for pests Farming: some crops will grow better, some will grow worse

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How will climate change affect people? Understanding: Low Everywhere: How will humans react Surprise changes WA Increased winter flooding Increased landslides Overall forest health Coastal erosion

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