To meet scientists' recommendations, total global CO2 emissions should be reduced to about million metric tons. 16,000 34,000 22,000 The last time that global CO2 emissions were at or below this level

To meet scientists' recommendations, total global CO2 emissions should be reduced to

about
million metric tons.
16,000
34,000
22,000
The last time that global CO2 emissions were at or below this level was in the
1990s
1970s
2000s

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