The jet stream changes from year to year due to natural climate variability
, Screen explained, so it is difficult to detect "robust trends.
When support for doing something about climate change is based on personal observations of local weather, policymaking may end up being dictated by the roulette wheel of natural climate variability
, Ricke said.
Other explanations have included natural climate variability
and observational errors.
A combination of the natural climate variability
, a non diversified livelihoods and the absence of the sustainable
Climate change means a change of climate which is attributed directly or indirectly to human activity that alters the composition of global atmosphere and which is in addition to natural climate variability
observed over comparable time periods.
Regarding attribution studies, rather than trying to reject either hypothesis regardless of which is the null, there should be a debate over the significance of anthropogenic warming relative to forced and unforced natural climate variability
Among the "myths" that Orbach tackles: that the earth has been cooling since 1998, that carbon dioxide concentrations in the atmosphere are maxed out and water is a more powerful greenhouse gas than carbon dioxide anyhow, and that climate change can be attributed to natural climate variability
Contrary to the claims of climate skeptics, the report emphasizes that warming trends cannot be explained by natural factors such as changes in incoming energy from the sun or natural climate variability
Similarly, the 2009-2010 winter cold spell was consistent with the natural climate variability
displayed in the climate records.
of Alabama in Huntsville and a former NASA climate scientist, argues that the prevailing view of climate change, in which human activity is the cause, is wrong, and that instead, natural climate variability
is the main cause, through internal cycles that cause periods of warming and cooling over thousands of years.