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File: Contrails of KLM Boeing 747-400 over Khimki 22-Oct-2011. Wikimedia Commons

Researchers have found that contrails – the white lines that airplanes leave behind in the sky – are a major cause of global warming and their impact on the climate was expected to triple by 2050.

The study, published on Thursday in the journal Atmospheric Chemistry and Physics, found that due to increased air traffic activity, contrail-induced warming was expected to be thrice larger in 2050 than what it was in 2006.

Contrails change global cloudiness which creates an imbalance in the Earth’s radiation budget – called radiative forcing – that results in warming of the planet. The larger this radiative forcing, the more significant the climate impact.

Noting that non-carbon dioxide climate impacts could not be neglected, researchers said that the increase was predicted to be faster than the rise in carbon dioxide radiative forcing since expected fuel efficiency measures would reduce carbon dioxide emissions.

In 2005, air traffic made up about five per cent of all anthropogenic radiative forcing, with contrails being the largest contributor to aviation’s climate impact. Pixabay

The increase in contrail radiative forcing was due to air traffic growth and a shift of flight routes to higher altitudes. According to researchers, cleaner aircraft emissions would solve part of the problem. In 2005, air traffic made up about five per cent of all anthropogenic radiative forcing, with contrails being the largest contributor to aviation’s climate impact.

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“It is important to recognise the significant impact of non-carbon dioxide emissions such as contrails on climate and to take those effects into consideration when setting up emission trading systems or schemes like the Corsia agreement,” said the study’s lead author Lisa Bock from the German Aerospace Center.

Corsia – UN’s scheme to offset air traffic carbon emissions from 2020 – ignores the non-carbon dioxide climate impacts of aviation. (IANS)


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Indian wrestler Ravi Kumar (57kg) and Deepak Punia (86kg) enjoyed fruitful outings at the Tokyo Olympic Games as they secured semifinal berths in their respective weight categories at the Makuhari Messe on Wednesday.

On the opening day of the wrestling competition, Ravi Kumar defeated Bulgaria's Georgi Vangelov 14-4 on technical superiority to reach the last-four in the men's 57kg category, while compatriot Deepak Punia overcame China's Zushen Lin 6-3 on points to advance to the semifinals.

Ravi Kumar will take on Nurislam Sanayev of Kazakhstan in the last-four, while Punia will be up against David Morris Taylor of the USA.

Earlier, Ravi Kumar had won his opening-round bout by technical superiority against Colombia's Oscar Tigreros to secure a quarterfinal spot. Competing in the Round-of-16 bout against the Colombian wrestler, the 23-year-old Ravi Kumar, who is making his Olympic debut, showed no nerves as he dominated the bout to win by technical superiority (13-2).

Ravi Kumar landed attack after attack and went 13-2 up, winning the bout by technical superiority with minutes to spare. In wrestling, building up a 10-point lead over the opponent results in a victory by technical superiority.

India's 86kg freestyle wrestler Deepak Punia showed no signs of the niggle that had forced him to pull out of the Poland Open Ranking Series in Warsaw in June, as he defeated Nigeria's Ekerekeme Agiomor on technical superiority to secure a quarterfinal berth.

He got his Olympic campaign to a fine start as he was in control from the start of the bout and hardly ever allowed his Nigerian opponent any room to maneuver his moves, finally winning with a 12-1 on technical superiority.

Punia, who had also suffered an elbow injury just before the Games, was slow at the start but came into his own as the bout progressed, inflicting takedowns at regular intervals to earn points.

The Indian wrestler eased into a 4-1 lead at the break and extended his lead comfortably in the second period.

Punia, the silver medallist from the 2019 world wrestling championships, then set up a clash with China's Lin Zushen in the quarterfinals and defeated him 6-3.