Sentences with phrase «by human greenhouse gas emissions over»

Not exact matches

The scientists looked at the so - called biogenic fluxes or flow of the three greenhouse gases on land that were caused by human activities over the last three decades and subtracted out emissions that existed «naturally» during pre-industrial times.

Scientists can confidently say that Earth is warming due to greenhouse gas emissions caused by humans, but data on climate trends over the Antarctic and the surrounding Southern Ocean only go back to 1979 when regular satellite observations began.

The key conclusions were that: It is «unequivocal» that global warming is occurring; the probability that this is caused by natural climatic processes is less than 5 %; and the probability that this is caused by human emissions of greenhouse gases is over 90 %.

In theory, the goal of the Paris talks over a new global climate agreement is to create a more sustainable human relationship with the climate system by curbing emissions of greenhouse gases and boosting poor countries» capacity to withstand climate shocks.

Thus a grand solar minimum would have to cause about 1 °C cooling, plus it would have to offset the continued human - caused global warming between 1 and 5 °C by 2100, depending on how our greenhouse gas emissions change over the next century.

Scientists in the US say parts of Australia are being slowly parched because of greenhouse gas emissions — which means that the long - term decline in rainfall over south and south - west Australia results from fossil fuel burning and depletion of the ozone layer by human activity.

The average land temperature on earth has risen 2.5 degrees Fahrenheit over the past 250 years — essentially all of it caused by human emission of greenhouses gases.

Over the past several centuries, human greenhouse gas emissions have caused by far the largest radiative forcing (energy imbalance), and thus must be the driver of any observed long - term global warming.

However, the amount of warming caused by human greenhouse gas (GHG) emissions is known to a high degree of certainty, and these same studies have all found that GHGs are responsible for over 100 % of the observed warming over this timeframe (Figure 3).

By then comparing the results of these Industrial and Non-industrial simulated climates, and recording the occurrence of floods like that of Autumn 2000 in each of them, the change in the frequency of occurrence (or «risk») of such a flood was determined, and therefore how much risk is attributable to human - induced emissions of greenhouse gases over the last century.

We further recognize the need to reduce the global emission of greenhouse gases by 80 % by mid-century at the latest, in order to avert the worst impacts of global warming and to reestablish the more stable climatic conditions that have made human progress over the last 10,000 years possible.

So, in order to trigger another LIA, a new grand solar minimum would have to cause about 1 °C cooling, plus it would have to offset the continued human - caused global warming of 1 to 5 °C by 2100, depending on how our greenhouse gas emissions change over the next century.