Sentences with phrase «greenhouse gas emissions scenarios did»

Crucially, lower greenhouse gas emissions scenarios did not always lead to widespread tree mortality.

Not exact matches

Politics of deferred gratification Under one of the additional scenarios, known as RCP 4.5, humans take longer to reduce greenhouse gas emissions but eventually do so, and under the other, known as RCP 8.5, carbon dioxide concentrations continue to rise through 2100.

Pieter Tans, a climate scientist at the National Oceanic and Atmospheric Administration who wrapped up the panel, said that while governments and policymakers should still aggressively pursue the goal of reducing greenhouse gas emissions, he did not believe that the most severe IPCC scenario, RCP 8.5, was likely.

More to the point, I don't see any IPCC scenario in which the news is good vis - a-vis greenhouse gas emissions.

While the researchers, led by Shaun Marcott of Oregon State, conclude that the globe's current average temperature has not exceeded the warmth that persisted for thousands of years after the last ice age ended, they say it will do so in this century under almost every postulated scenario for greenhouse gas emissions.

First, the complicated models that develop emissions scenarios don't seem to be necessary for forcing the climate models; simply specifying a value of CO2 concentration (with the other greenhouse gases and anthropogenic aerosol) at 2100 along with a simple time trajectory is sufficient to force the climate model.

The chart does not include those scenarios assuming mitigation targets and policies that went above and beyond the INDCs, nor does it include the IEA, which reports energy and process - related greenhouse gas emissions.

«Based on the science going into them, the [next] IPCC reports will have a real impact in offering diplomats a reckoning — and they don't handle reckonings well — with the observation that [greenhouse gas] emissions are all following the worst of the worst - case scenarios for the future.»

Wehner and his co-authors of Chapter 2 of the NCA, which looked at the physical basis for our understanding of climate change, considered seven different future scenarios (including four new ones), ranging from the «do nothing» option to a geoengineering option, which would require an as - yet uninvented technology to take CO2 out of the atmosphere on a global scale, to achieve net negative emissions of greenhouse gases by 2050.

«and we basically don't know whether or not different scenarios of greenhouse gas emissions will be (or not be) the primary driver on timescales of a century or less.»

Assuming we continue what you might call a business - as - usual scenario, where we don't mitigate greenhouse gas emissions, what we see are many places, particularly in the Southwest and Central Plains, that are going to see really significant drying, largely unprecedented at any time in the historical record, even going back 1,000 years.

The low greenhouse gas emissions scenario (RCP4.5 *) delays average climate departure to 2069 but does not prevent it.

That's in the IPCC AR4 Working Group 1, Summary for Policymakers, so one doesn't have to read very far to see what the IPCC actual projections are... that the projected trends are significantly lower than what Monckton claims and the fact that they are fairly scenario - independent over the next 20 years or so (which isn't that surprising given that it takes a while for the emissions in the various scenarios to diverge significantly and that half of the rise is projected to be due not to ANY additional emissions but simply to the greenhouse gases already present in the atmosphere).

Paragrap 17 «Notes with concern that the estimated aggregate greenhouse gas emission levels in 2025 and 2030 resulting from the intended nationally determined contributions do not fall within least - cost 2 ̊C scenarios but rather lead to a projected level of 55 gigatonnes in 2030, and also notes that much greater emission reduction efforts will be required than those associated with the intended nationally determined contributions in order to hold the increase in the global average temperature to below 2 ̊C above pre-industrial levels by reducing emissions to 40 gigatonnes or to 1.5 ̊C above pre-industrial levels by reducing to a level to be identified in the special report referred to in paragraph 21 below;»