Understanding Global Warming
of 1.5oC from IPCC Report 2018
- Human activities are estimated to have caused approximately 1.0oC pre-industrial levels, with a likely range of 0.8oC to 1.2oC. Global warming is likely to reach 1.5oC between 2030 to 2052(high confidence).
2 2. Warming
from anthropogenic emissions from the pre-industrial period to the present will
persist for centuries to millennia and will continue to cause further long-term
changes in the climate system, such as sea level rise, with associated impacts
(high confidence) but these emissions alone are unlikely to cause global
warming of 1.5oC (medium confidence). Anthropogenic emissions up to
present are unlikely to cause further warming of more than 0.5oC
over the next two to three decades or on a century time scale. Reaching and
sustaining net zero global anthropogenic CO2 emissions and declining
net non-CO2 radiative forcing would halt anthropogenic global
warming on multi-decadal time scales.
3. Climate
related risks for natural and human systems are higher for global warming of
1.5oC than at present but lower than at 2oC. These risks
depend on the magnitude and rate of warming, geographical location, levels of
development and vulnerability, and on the choices and implementation of
adaptation and mitigation options.
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