In their feeble analysis of anthropogenic global warming and the climate change it brings, deniers only too readily discount the impact of eight billion people on any natural cycles.
they don't want to believe that human activity such as the burning of fossil fuels such as coal, oil and gas and the transfer of the carbon therein to the air from formerly stable deposits underground in the blink of an eye in terms of geological time could have an impact on Earth's cycles.
deniers live proudly with their head in the ground, scared of facing the reality they've helped create.
so it's interesting to read in a New Scientist article on Feb. 27 republished on Google news some discussion of these matters, extracts of which are cut and pasted below. the discussion also includes mention of the cycles of ice ages, the timing of which deniers are clueless.
NEW SCIENTIST:
"Changes in Earth’s orbit drive long-term glacial cycles, but a new forecast suggests this ancient pattern is being disrupted for tens of thousands of years due to human-induced global warming
"By James Dinneen
"The more than 1.5 trillion tonnes of carbon dioxide humans have emitted into the atmosphere since the industrial revolution are expected to cause enough warming to disrupt this long-term glacial cycle.
"The amount we’ve already put into the atmosphere is so great that it will take hundreds to thousands of years to pull that out via natural processes,” says Stephen Barker of Cardiff University.
"However, he says more research is needed to define Earth’s future natural climate in more detail.
"This is in line with earlier modelling that suggests rising CO2 levels due to anthropogenic emissions will prevent the onset of the next glacial period for tens to hundreds of thousands of years, says Andrey Ganopolski at the Potsdam Institute for Climate Impact Research in Germany.
"However, he says even pre-industrial levels of CO2 in the atmosphere may have been high enough to delay the advance of the ice sheets by 50,000 years. That is due to the unusually minor orbital variations expected in coming millennia and the unpredictable way Earth responds to those changes."
