Friday February 22, 2019
Home Uncategorized Extinction of...

Extinction of large animals could hasten climate change

0
//

London: The extinction of large animals could hasten climate change as their presence in tropical forests help in dispersing tresses with dense wood which are more effective in storing carbon dioxide from the atmosphere than smaller trees.

The reduction of large animals from tropical forests could make climate change worse as these animals are essential in scattering trees with dense wood.

A decline in fruit-eating animals such as large primates, tapirs and toucans could have a knock-on effect for tree species, the findings showed.

“We show that the decline and extinction of large animals will over time induces a decline in large hardwood trees. This in turn negatively affects the capacity of tropical forests to store carbon and therefore their potential to counter climate change,” said one of the researchers Carlos Peres from University of East Anglia in England.

Large animals disperse large seeded plant species – often associated with large trees and high wood density — which are more effective at capturing and storing carbon dioxide from the atmosphere than smaller trees, the researchers explained.

The research team studied data from more than 2,000 tree species in Brazil’s Atlantic Forest, and more than 800 animal species.

They found that frugivores which are not targeted by hunters — such as small birds, bats and marsupials — are only able to disperse small seeds, which are associated with small trees.

Meanwhile large heavy-wooded trees, which can capture and store greater amounts of carbon, are associated with larger seeds. And these are only dispersed by large animals.

“The big frugivores, such as large primates, the tapir, the toucans, among other large animals, are the only ones able to effectively disperse plants that have large seeds. Usually, the trees that have large seeds are also big trees with dense wood that store more carbon,” Prof Mauro Galetti from Sao Paulo State University in Brazil explained.

The findings appeared in the journal Science Advances. (IANS)(image courtesy: timedotcom.files.wordpress.com)

Next Story

Americans ‘Alarmed’ by Climate Change Double in Just 5 Years

Twenty-nine percent of respondents to the poll conducted last December by Yale and George Mason universities.

0
Paris Climate Meet, Global Warming
A woman displays a placard during a demonstration in New York on June 1, 2017, to protest U.S. President Donald Trump's decision to pull out of the 195-nation Paris climate accord deal. VOA

The proportion of Americans found to be “alarmed” by climate change has doubled in just five years, the pollsters behind a nationwide survey revealed on Tuesday.

Twenty-nine percent of respondents to the poll conducted last December by Yale and George Mason universities were in the alarmed category — an all-time high — and twice the percentage of those surveyed in 2013.

More than 1,100 adults across the United States were asked about their beliefs, attitudes and behaviors toward climate change.

The answers were then used to classify respondents into six groups, from dismissive, or least worried about climate change, to alarmed, for those most worried.

US, New York
FILE – People cool off at the Unisphere in Queens, New York, July 2, 2018. VOA

Those deemed dismissive of global warming represented 9 percent of respondents, a drop of five points compared to 2013.

‘Green New Deal’

The findings come amid a growing polarization of the political debate over the issue of global warming in the United States.

The decision by U.S. President Donald Trump to pull out of the Paris climate deal has fired up his base, while opponents have championed a “Green New Deal” that seeks to eliminate the nation’s heat-trapping greenhouse gas emissions within a decade.

The 2015 Paris accord, agreed by nearly 200 nations, seeks to wean the global economy off fossil fuels in the second half of this century, limiting the rise in average temperatures to “well below” 2 degrees Celsius (3.6 Fahrenheit) above pre-industrial times.

The increased visibility of global warming such debates generate could explain Americans’ rising concern, said Kenneth Sherrill, a political science professor emeritus at Hunter College in New York City.

New York, Climate
The climate in New York City in 60 years could feel like Arkansas now. Pixabay

“The more information you get there more interested that you are,” he said.

Academic research has further shown that growing exposure to bouts of extreme weather may also change minds, he added. “And it results in higher concern.”

Climate change influences economy

Climate change will cost the U.S. economy hundreds of billions of dollars by the end of the century, hitting everything from health to infrastructure, according to a 2018 government report, the Fourth National Climate Assessment Volume II.

ALSO READ: Global Warming Could Change US Cities’ Climate by 2080- Study

Meanwhile, three of the five costliest hurricanes in the United States — Harvey, Maria and Irma — occurred in 2017, according to the National Oceanic and Atmospheric Administration, part of the U.S. Commerce Department. (VOA)