Guest Post: As India cuts aerosol air pollution, extreme temperatures may spike making heat health adaptation plans crucial

An insightful article into India's situation with regards to the air pollution problem and extreme heatwave temperatures. This year temperatures spiked to 51C in north western India: Wet Bulb Near 35 C — Heatwave Mass Casualties Strike India Amidst Never-Before-Seen High Temperatures.

The researchers argue that aerosols from air pollution are likely to have a substantial cooling impact at the moment, even as India experiences record temperatures. With roll out of renewables and the push to electrify vehicle transport, air pollution will likely be reduced increasing health outcomes. But it may be at the expense of a spike in temperatures at this time of year which will have a large heat health impact on the population, especially poorer people who cannot afford technological adaptation measures such as air-conditioning. It is another reason why recently implemented adaptation plans in India for heat health are so important, as well as taking effective and rapid emissions reduction on a global level in accordance with the UNFCCC Paris Agreement.

What is going on with India's weather?

Sarah Perkins-Kirkpatrick, UNSW Australia; Andrew King, University of Melbourne, and Geert Jan van Oldenborgh

Moderate Volcanic activity slowing global warming by 25% suggests study

Atmospheric warming has slowed over the last decade, and scientists from the University of Colorado at Boulder believe the cause of this may be all the small to medium volcanic eruptions spewing sulphur dioxide high into the atmosphere where it changes the reflectivity of the top of the atmosphere.

It is well established that major volcanic eruptions like Mount Pinatubo in the Philippines in 1991 emit millions of tons of sulphur dioxide that effectively cool the earth slightly for several years. It has also been theorised that the stagnation in global warming in the mid twentieth century was caused by the atmospheric nuclear testing carried out between 1945 and 1980. It seems that nuclear winter actually occurred, although on just a small scale. A small nuclear war would also likely cause global cooling through the amount of particulate matter thrown up into the stratosphere. But really this is not something to even contemplate happening due to the amount of death and devastation involved.

Scientists have theorised that other reasons for the slowing in the rate of atmospheric global warming over the last decade is that a greater proportion of heat is being taken up by the world's oceans; and secondly that Asia, particularly India and China, have increased their sulphur dioxide emissions from coal fired power by 60% between 2000 and 2010 which has increased the stratospheric aerosol layer of the atmosphere changing the reflectivity.