As Green Building are more than just a Trend . . . In the MENA countries, some concerns about sustainability started to be heard of back in the 1970s; in fact it was more of a follow-on trend than anything else. With the region’s increasing urbanisation impacting the environment, Green Building became an option for [ . . . ]
and Cooling the Climate than we thought!
The pre-industrial atmosphere contained more particles, and so brighter clouds, than we previously thought. This is the latest finding of the CLOUD experiment, a collaboration between around 80 scientists at the CERN particle physics lab near Geneva. It changes our understanding of what was in the atmosphere before humans began adding pollution – and what it might be like again in the future.
Most cloud droplets need tiny airborne particles to act as “seeds” for their formation and growth. If a cloud has more of these seeds, and therefore more droplets, it will appear brighter and reflect away more sunlight from the Earth’s surface. This in turn can cool the climate. Therefore understanding the number and size of particles in the atmosphere is vital to predicting not only how bright and reflective the planet’s clouds are, but what global temperatures will be.
Today, around half of these particles come from natural sources. That includes dust from the ground, volcanoes, wildfires that make soot, or sea spray that evaporates midair leaving behind tiny specs of salt in the atmosphere.
Many airborne particles also result from us burning fossil fuels. This produces soot, but also sulphur dioxide gas which is made into sulphuric acid in the atmosphere. As well as causing acid rain, sulphuric acid molecules can stick together and grow into particles . . .