How do scientists know that the atmospheric buildup of greenhouse gases is due to human Agent activity? [ 6CANADAQFP 0 MCLH 07/11/2013 ]

This usage differs from that of the UNFCCC, where climate change refers to a change of climate that is attributable directly or indirectly to human Agent activity that alters the composition of the global atmosphere and that is in addition to natural climate variability observed over comparable time periods. [ 2IPCCBIODIVERSITE 0 MCLH 07/11/2013 ]

In large part, the scientific debate over whether human Agent activity has provoked climate change is over. Exactly how it will change remains a question. [ AWORLDOFSCIENCE 0 MCLH 07/11/2013 ]

The report points the finger at human Agent activity outside the region Location - the emission of greenhouse gases in industrialised countries. [ newcourrier 0 MCLH 07/11/2013 ]

This is not the case, however, for emissions of these gases related to forestry Patient activities and projects, which are not included in Annex A, although some of these forestry activities are discussed in the 1996 Revised IPCC Guidelines for National Greenhouse Gas Inventories. [ ipccsr 0 MCLH 07/11/2013 ]

Humans are adding large quantities of fine particles (aerosols) to the atmosphere, both from agricultural and industrial Patient activities. [ 5CANADAICC 0 MCLH 07/11/2013 ]

The half of the additional flux due to industrial Patient activity, amounting to a nearly 8 GtC.yc-1, goes to the atmosphere. [ JACLET 0 07/11/2013 ]

The pressing demands of certain countries, including Canada, [lie United States of America and the Russian Federation, to ease their efforts in reducing greenhouse-gas emissions in relation to the biospheric carbon sinks they already possess or will develop, notably by agroforestry Patient activities. [ JACLET 0 MCLH 04/04/2014 ]

Conflicting analyses make it difficult to draw definitive conclusions about changes in storm Cause activity, especially in the extra-tropics. [ GREENFACTS 0 MCLH 04/04/2014 ]

More recently, the variations in solar Cause activity constitute a plausible, explanation for the cold period in the seventeenth and eighteenth centuries known as the Little Ice Age, which was all the more remarkable since it followed closely the medieval climatic optimum. [ JACLET 0 MCLH 04/04/2014 ]

The absolute value of the spectrally integrated total solar irradiance (TSI) incident on the Earth is not known to better than about 4 Wm?2, but satellite observations since the late 1970s show relative variations over the past two solar Cause 11-year activity cycles of about 0.1 % , which is equivalent to a variation in radiative forcing of about 0.2 Wm?2. [ 11IPCCBILAN2001 0 MCLH 14/04/2014 ]

Thunderstorm Cause activity is difficult to measure on a broad scale, however, because thunderstorms are highly localized and brief in duration. [ 2CANADACCD9801 0 MCLH 04/04/2014 ]

The global mean atmosphere-ocean exchange of CO2, the vertical mixing of total dissolved carbon by thermohaline overturning and diffusion, and the sinking of particulate material produced by biological Cause activity can all be represented in this model. [ 10IPCCMODELE 0 MCLH 04/04/2014 ]

Since greenhouse warming may cause a greater area of ocean to reach this temperature more often, it follows that the zone of hurricane Cause activity could expand and the number of hurricanes could increase. [ 2CANADACCD9801 0 MCLH 04/04/2014 ]

Increases in heavy precipitation events can arise from a number of causes, e.g., changes in atmospheric moisture, thunderstorm Cause activity and large-scale storm activity. [ GREENFACTS 0 MCLH 04/04/2014 ]

However, the recent intensification of El Niño Cause activity itself raises serious questions. [ 2CANADACCD9801 0 MCLH 04/04/2014 ]

Canadian researcher Steven Lambert recently examined winter storm Cause activity in the extratropical Atlantic and Pacific Location since the beginning of the present century. [ 2CANADACCD9801 0 MCLH 04/04/2014 ]

It is possible the longer term changes in the amount of volcanic Cause activity on the Earth Location may explain incidences of longer term climate change during Earth History. 66 million years ago, at about the same time as the extinction of the dinosaurs, massive amounts of lava were being erupted on the Indian sub-continent, at that time drifting North towards Asia, having separated from Australia and Antarctica. [ ENCY 0 MCLH 04/04/2014 ]

Observational evidence shows a connection between lightning Cause activity around the world Location and variations in global surface temperature. [ 2CANADACCD9801 0 MCLH 04/04/2014 ]

The strongest natural fluctuation of climate on interannual timescales is the ENSO phenomenon (see Box 4). It is an inherently coupled atmosphere-ocean mode with its Cause core activity in the tropical Pacific Location , but with important regional climate impacts throughout the world. [ 11IPCCBILAN2001 0 MCLH 04/04/2014 ]