פרסומים אחרונים במדור "סביבה"

A re-evaluation in 2013 of the effect of water vapor in the climate models showed that James Hansen's outcome would require ten times the amount of CO2 we could release from burning all the oil, coal, and natural gas in Earth's crust

https://rationalwiki.org/wiki/Just_asking_questions :)

For population ... it was assumed that each grid cell follows the trend of the country it belongs to (linear downscaling algorithm). For income (GDP per capita), the data was downscaled from the regional to the country level by assuming that poorer countries in a region grow faster than richer countries...

GMSL will rise between 0.43 m (0.29–0.59 m, likely range; RCP2.6) and 0.84 m (0.61–1.10 m, likely range; RCP8.5) by 2100 (medium confidence) relative to 1986–2005. .

Section 4.3 assesses how mean and extreme sea level changes translate into coastal hazards (e.g., flooding, erosion and salinity intrusion), how these interact with socioeconomic drivers of coastal exposure and vulnerability, and how this interaction translates into observed impacts and projected risks for ecosystems, natural resources and human systems.

- the IPCC AR5 concluded that there is little evidence for such a tipping point based on more recent studies that used global climate models and low-order sea ice models.
- The IPCC AR5 WGII report stated with medium confidence that precise levels of climate change sufficient to trigger a tipping point remain uncertain, but that the risk associated with crossing multiple tipping points increases with rising temperature.

“We’re talking of billions of years in the future. Also, come on, come on, folks, I think we need to pay attention here and now. We seem to be on course to destroy our planet within the next couple of hundred years, so..."

The bottom line is that nearly all of the theoretical and computer modeling work suggest that hurricanes may be slightly stronger (by a few percent) by the end of the 21st Century, even presuming that a large global warming will occur.

The climate models are also coming into agreement that the number of tropical storms and hurricanes will not go up and may perhaps even decrease (by around one-fourth fewer) because of the increased vertical wind shear.

It is likely - in my opinion - that manmade global warming has indeed caused hurricanes to be stronger today. However, such a linkage without answering the more important question of - by how much? - is, at best, incomplete and, at worst, a misleading statement. The 1-2 mph change currently in the peak winds of strong hurricane due to manmade global warming is so tiny that it is not measureable by our aircraft and satellite technologies available today.

‏¹ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4643791/

"Although the Sun produces gamma rays as a result of the nuclear-fusion process, internal absorption and thermalization convert these super-high-energy photons to lower-energy photons before they reach the Sun's surface and are emitted out into space. As a result, the Sun does not emit gamma rays from this process, but it does emit gamma rays from solar flares."