"The percentage of Atlantic hurricanes that have experienced rapid intensification has tripled since the 1980s, it's not something that we can explain by natural climate variability
," said Dahl.
During the time of the medieval megadroughts, increased radiative forcing was caused by natural climate variability
. But today we are experiencing increased dryness in many locations around the globe due to human-made forces.
The increase in global average surface temperature over the past half-century cannot be fully explained by natural climate variability
, e.g., responses to Earth's orbital changes over thousands of years, or natural climate forcing such as from solar or volcanic variability.
A change of climate that is directly or indirectly related to human activity that alters the composition of the global atmosphere and which is in addition to natural climate variability
of Noise Pollution.The environmental factors caused mortality in children of Pakistan, ranks highest in South Asia.
The anthropogenic signal would only slowly emerge from natural climate variability
"Rescuing data from the archives, pulling together documentary sources and making this data available to researchers will allow us to better understand the global, regional and national aspects of the climate system, refine our models for the future and ensure we become more resilient to both natural climate variability
and human-caused climate change."
Climate change is associated directly or indirectly to human activities that alter the global atmospheric composition which in addition to natural climate variability
observed over comparable time periods.
He added, however: "That is not to say that climate change may not impact the jet stream in the future." The jet stream changes from year to year due to natural climate variability
, Screen explained, so it is difficult to detect "robust trends." Reading University climatologist Paul Williams told AFP that "equator-to-pole temperature difference is decreasing in the bottom few kilometers of the atmosphere because of rapid Arctic warming." Research shows "evidence that the lower part of the jet stream is weakening as a consequence," Williams said.
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.
"Natural climate variability
always gives us a wild ride," notes Bill Patzert, a climate scientist with NASA's Jet Propulsion Laboratory in California.
Other explanations have included natural climate variability
and observational errors.