Climate change, Does it matter? Martin Hedberg meteorologist Swedish Weather Center.

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Presentation transcript:

Climate change, Does it matter? Martin Hedberg meteorologist Swedish Weather Center

Weather (Precipitation, clouds, winds, humidity, temperature…) Natures way of balancing forces in the atmosphere.

Climate Climate: Statistics about the weather. Climate is the average weather pattern over a longer period of time. 100 years

Climate change (Weather patterns, glaciers, sea level rise…) Climate change is a significant change in weather patterns. When you put it in the perspective of a longer period of time you find it has happened many times before years

Greenhouse effect At any planet with an atmosphere.

Energy radiates from the earth surface Radiation from the sun warms the earths surface Without greenhouse gases: -18 degrees! With greenhouse gases: +15 degrees! Greenhouse gases are being warmed by the radiation from earth Energy radiates from the atmosphere

External causes Solar activity Earths orbit Meteorites Internal causes Anthropogenic Emissions of greenhouse gases Particles/clouds Land change Internal causes Natural Feedback Volcanic eruption Chance - Climate change -

Greenhouse gases Particles Left in the atmosphere for 1 week Left in the atmosphere for 100 years (mostly a cooling effect) (has a warming effect)

Roger Revelle and Hans E. Suess. Carbon Dioxide Exchange Between Atmosphere and Ocean and the Question of an increase of Atmospheric CO 2 during the Past Decades. Tellus 1957.

CO 2 Easy to make statistics from Easy to compare to historical climate There are more greenhouse gases, both natural and anthropogenic There are more things than greenhouse gases that affect the climate Carbon dioxide is used to describe how we affect the climate

Ice age Year 1900 Year 2100? Year 2000 Climate change within 100 years: About half an ice age, but on the warm side

Easy to make statistics from Easy to compare to historical climate change Might misunderstand climate-temperature vs. daily temperature Climate change is also precipitation, humidity, winds etc Temperature as a tool to measure climate change

The thermometer is how we measure climate change But it isnt about the temperature itself. It is all about the consequences.

Ideström & Skinnarmo

Its getting warmer. More evaporation. And more rain. Sea-levels are rising, Glaciers are melting, Extreme weather... Plants and animals adapt, or disappear. People and societies adapt.

Its just natural climate change When we understand all the physics, we can stop it Somebody else has to lower their emissions Humanity's large self-deception

Many small steps. They all add up.

More effective use of energy Renewable energy Capture carbon dioxide from both bio-fuels and fossil fuels

Weather patterns change When, where, how often, strength… Average temperature rises More/heavier precipitation Flooding, landslides… More evaporation. Drought, erosion, wildfires…

Long braking distance Climate has…

Domino effects Climate has…

Many irreversible processes Climate has…

YES Climate change matters. As usual.