may give cause for some to question the wider role of climate change and not solely global warming, that are
induced by anthropogenic emissions, changes in land use, water quality etc for which there is direct empirical data in the form of images, and not in mathematical treatments of theory and simulated models.
This is an order of magnitude smaller than the likely warming
induced by anthropogenic emissions over the same time period.
Not exact matches
Therefore, it is possible that all of the rise in atmospheric CO2 concentration and all of the change to the 13C: 12C atmospheric isotope change were caused
by the
anthropogenic emission that
induced the unknown, natural (i.e. non-
anthropogenic) effect that caused the observed change to the 12C: 13C isotope ratio of atmospheric CO2.
One of the problems with the EPA's Endangerment TSD is the nearly complete disregard of observed trends in a wide array of measures which
by and large show that despite decades of increasing
anthropogenic greenhouse gas
emissions the U.S. population does not seem to have been adversely affected
by any vulnerabilities, risks, and impacts that may have arisen (to the extent that any at all have actually occurred as the result of any human -
induced climate changes).
Happer accepts the assumption — and it is only an assumption — that the rise in atmospheric CO2 is
induced by the trivial
anthropogenic emission of CO2.
Originally denoted «climate change skeptics» or «
anthropogenic (human -
induced) global warming skeptics», the term referred to those who are as yet unconvinced
by evidence that
emissions of man - made CO2 significantly enhance the natural atmospheric greenhouse effect.
To slow the rate of
anthropogenic -
induced climate change in the 21st century and to minimize its eventual magnitude, societies will need to manage the climate forcing factors that are directly influenced
by human activities, in particular greenhouse gas and aerosol
emissions.
While it is generally accepted that the observed reduction of the Northern Hemisphere spring snow cover extent (SCE) is linked to warming of the climate system caused
by human
induced greenhouse gas
emissions, it has been difficult to robustly quantify the
anthropogenic contribution to the observed change.