Evidence For Climate Change Flashcards
What is the last 2.6 million years called?
Quaternary period
Today’s temperature is higher than the last……?
400,000 years
Since 1880, how much has the global temperature increased by?
0.58 degrees Celsius
How do we know the temperature from the distant past?
We can study oxygen trapped in ocean sediments or water molecules from ice cores and calculate the temperature.
What are some recent evidence of a warming world?(3)
Shrinking glaciers
Rising sea levels
Seasonal changes
How much percent has the arctic sea ice thinned?
65% since 1975
How much has the sea risen in the last 100 years?
10-20cm
Why have the sea levels risen?
-Glaciers melting release more freshwater into the sea.
-Thermal expansion - the sea expands in volume as it warms
What are seasonal changes?
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