what sort of climate
change evidence do we already have?
* We are currently
experiencing the highest
global temperature rise
recorded in recent geological
* The temperature
trend is accelerating.
While climate model projections predicted that the Arctic ice cover may
be totally melted by 2050 to 2100, current observations show that this
may happen much earlier.
* In Antarctic,
loss of ice
been happening since late 1940s, the collapse of the Larsen B in 2002
being one of the biggest events.
* Sea level
also underestimated the sea level rise. An average temperature increase
of only a few degrees has in the past caused sea levels to rise many
of carbon dioxide
is accelerating. It was 180-300ppm during the past 650,000 years, until
1800s. Today it is almost 400ppm, and it only needs to go up to 450ppm
when the world's large ice sheets start melting at a rate that will
significantly rise the sea levels. At the current pace, this will
happen in 40-50 years.
levels were 300-700ppb during the past 650,000 years. During the past
200 years (and particularly the past 40 years) they have risen to
* Permafrost - the
by definition - has started
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does that mean?