Evidence For Climate Change Flashcards

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1
Q

What is the last 2.6 million years called?

A

Quaternary period

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2
Q

Today’s temperature is higher than the last……?

A

400,000 years

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3
Q

Since 1880, how much has the global temperature increased by?

A

0.58 degrees Celsius

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4
Q

How do we know the temperature from the distant past?

A

We can study oxygen trapped in ocean sediments or water molecules from ice cores and calculate the temperature.

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5
Q

What are some recent evidence of a warming world?(3)

A

Shrinking glaciers
Rising sea levels
Seasonal changes

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6
Q

How much percent has the arctic sea ice thinned?

A

65% since 1975

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7
Q

How much has the sea risen in the last 100 years?

A

10-20cm

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8
Q

Why have the sea levels risen?

A

-Glaciers melting release more freshwater into the sea.
-Thermal expansion - the sea expands in volume as it warms

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9
Q

What are seasonal changes?

A

The changing of the timing of natural seasonal events such as tree flowering and bird migration.

In the 1990s, 65 species nested 9 days earlier than in the 1970s

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