Sunday May 26, 2019
Home Uncategorized Global warmin...

Global warming may affect pesticide effectiveness

0
//
Image Source- www.sciencedaily.com

New Delhi: The effectiveness of an important mosquito-fighting insecticide may be impaired by global warming, according to a recent study.

Two researchers from Montana State University, graduate student Shavonn Whiten and Robert Peterson, have shown that permethrin becomes less effective at killing the yellow fever mosquito (Aedes aegypti) as temperatures increase.

These mosquitoes, which are found in the tropics and the subtropics, can transmit viruses that lead to dengue, chikungunya, yellow fever, and other diseases.

“Many of the areas where these insecticides are employed have varying drastic temperature changes,” Shavonn Whiten said.

The researchers exposed adult mosquitoes to varying concentrations of permethrin at a range of temperatures.

They found an inverse relationship between death and temperature from 16 AoC to 30 AoC, which showed the highest negative correlation.

From 30 to 32, there was, however, a positive correlation between mortality and temperature. And from 32 to 34, the negative correlation resumed.

“It probably has something to do with variability and heat stress,” said Peterson.

“Once you get to those higher temperatures, there are other things going on regarding stress on the mosquito that cancel out the effect of the pyrethroids (a class of pesticides to which permethrin belongs) working better at lower temperatures and worse at higher temperatures,” he explained.

People involved in mosquito-control efforts should take temperature into account when choosing a pest control product, researchers said.

The study was published in the Journal of Medical Entomology.

(IANS)

Next Story

EU Countries Consume Earth’s Resources Faster than they can be Renewed: Report

Some 100 Greenpeace activists and students from several European countries marched through Sibiu carrying a huge banner saying "Broken Climate Broken Future"

0
earth's resources
France's President Emmanuel Macron, right, and President of the European Commission Jean-Claude Juncker speak during the informal meeting of European Union leaders in Sibiu, Romania, May 9, 2019. VOA

The European Union’s 28 countries consume the Earth’s resources faster than they can be renewed and none of them has sustainable consumption policies, a report released Thursday said, as EU leaders met to discuss priorities for the next five years.

“All EU countries are living beyond the means of our planet. The EU and its citizens are currently using twice more than the EU ecosystems can renew,” the report by the World Wide Fund (WWF) and Global Footprint Network said. It was issued as leaders met in the Romanian city of Sibiu to set the course for the bloc after Britain’s planned departure from the EU.

Climate change key priority

French President Emmanuel Macron said before the summit that climate change was among his key priorities and it was included in the bloc’s 10 “commitments” for the future until 2024, agreed by all the 27 leaders meeting in Sibiu.

earth's resources
The European Union’s 28 countries consume the Earth’s resources faster than they can be renewed and none of them has sustainable consumption policies. Pixabay

But the bloc is divided on how to achieve any ambitious climate goals and it remains far from clear how the Sibiu declaration would be implemented. Some 100 Greenpeace activists and students from several European countries marched through Sibiu carrying a huge banner saying “Broken Climate Broken Future.”

“We cannot talk about a prosperous future without a healthy climate,” Greenpeace climate activist Alin Tanase told Reuters. Views on concrete action to be taken to combat climate change differ between EU countries, influenced greatly by their dominant industries, such as carmakers in Germany or the coal industry in Poland.

Tusk sensitive to climate change

The chairman of the summit, President of the European Council Donald Tusk, said there was no future for politicians who were not sensitive to climate change and environment protection issues.

“The young generation is much more united on this than the member states. The truth is that nothing has changed when it comes to this divide and different opinions about this. What is new is this very fresh and energetic pressure,” he told a news conference after the summit.

climate change, earth's resources
Some 100 Greenpeace activists and students from several European countries marched through Sibiu carrying a huge banner saying “Broken Climate Broken Future.” VOA

Climate protection and sustainable development is also an important topic in the election campaign for the May 23-26 European Parliament elections, which will influence the leadership of European institutions and their programs.

The European Commission has been pushing for the EU to become climate neutral by 2050 through reducing carbon emissions that will otherwise boost the Earth’s average temperatures with devastating consequences.

“The EU uses up almost 20 percent of the Earth’s bio-capacity although it comprises only 7 percent of the world population,” the WWF report said. “In other words, 2.8 planets would be needed if everyone consumed at the rate of the average EU resident,” it said.

climate change, earth's resources
FILE – Climate change demonstrators hold banners in front of the Winston Churchill Statue during a protest near Parliament in London, April 12, 2019. VOA

ALSO READ: Billionaire Jeff Bezos Reveals Mockup of Lunar Lander, Embraces Trump’s Moon Timetable

Luxembourg smallest but fastest

It said the EU’s smallest and richest country, Luxembourg, was also the one which used up renewable resources the fastest last year. Just 46 days into the year, it had consumed its full share of the Earth’s resources, it said.

The EU’s poorest nation, Romania, took the longest to arrive at that point, on July 12th. But that was still earlier than the world’s average of Aug. 1, called Earth overshoot day. (VOA)