News / Science & Technology

The Science of Climate Change

Climate negotiators are meeting in Durban, South Africa beginning from November 28-December 9 to discuss the planet's changing climate.

The first decade of this century was the hottest on record.  

Polar ice is melting.

Global sea levels are rising.

And the vast majority of scientists attribute the changes to greenhouse gases, both natural from water vapor and man-made from burning fossil fuels, that trap heat in the lower atmosphere.  

"Since roughly the 1850s or so, we've seen an increase globally of about eight-tenths of a degree Celsius, so that's roughly 1.4 degrees Fahrenheit," said Todd Sanford, a climate scientist at the Union of Concerned Scientists in Washington.  

A one-degree difference is not noticeable in daily temperatures,  but a one-degree change in global average temperature is significant.

"One way to put that in perspective is that in the last Ice Age when there was, you know, a mile of ice above much of North America, the temperature difference between then and now was only roughly five or six degrees Celsius," Sanford said.

Alden Meyer, the director of climate strategy and policy at the Union of Concerned Scientists, says global warming affects weather and water cycles.

"You have increased flooding and extreme downpours combined with droughts and desertification in some regions of the world.  So there's tremendous variability here, and we're seeing that with extreme weather events on the increase, not only here in the U.S. but around the world," Meyer said.

A U.N. report shows that climate change hits poorer countries hardest.

William Orme with the United Nations Development Program explains:

"They tend to be arid, they tend to be rural, and they tend to be therefore most vulnerable to extreme weather events, drought, typhoons and deteriorating productivity of their soil resources, forest resources and fisheries," Orme said.

And global efforts to curb emissions and slow change have not helped yet. Again climate scientist Todd Sanford:

"Last year saw the largest single increase in history to the largest emissions amounts," Sanford said.     

NASA satellite evidence shows solar fluctuations have only a slight impact on global temperatures.

And while the vast majority of climate scientists agree that human activities play a role in climate change, they are not certain how that affects the planet.

Fred Singer is a well known climate change skeptic. He says there is not enough evidence to link human activities, climate change and environmental impacts.  

"Supposing the other side is wrong?  They are forcing us to make tremendous economic sacrifices which will induce poverty in the world," Singer said.

Other climate change scientists counter that argument, saying greener technologies can be viable -- environmentally and economically.

You May Like

UN: 1 Million Somalis at Risk of Hunger

Group warns region is in dire need of humanitarian aid, with at least 200,000 children under age of five acutely malnourished as drought hits southern, central part of nation More

Human Rights Groups Allege Supression of Freedoms in Thailand

Thailand’s military, police have suppressed release of independent report assessing human rights in kingdom during first 100 days of latest coup More

Jennifer Lawrence Contacts FBI After Nude Photos Hacked

'Silver Linings Playbook' actress' photos were posted on image-sharing forum 4chan; Federal Bureau of Investigations is looking into matter More

This forum has been closed.
Comments
     
There are no comments in this forum. Be first and add one

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
Ukraine Schools Resume Classes, Donate to Government Forcesi
X
September 02, 2014 12:58 PM
A new school year has started in Ukraine but thousands of children in the war-torn east are unable to attend because of ongoing clashes with pro-Russia rebels. In Ukraine's capital, patriotic education has become the norm along with donations to support injured security forces fighting to take back rebel-held areas. VOA's Daniel Schearf reports from Kyiv.
Video

Video Ukraine Schools Resume Classes, Donate to Government Forces

A new school year has started in Ukraine but thousands of children in the war-torn east are unable to attend because of ongoing clashes with pro-Russia rebels. In Ukraine's capital, patriotic education has become the norm along with donations to support injured security forces fighting to take back rebel-held areas. VOA's Daniel Schearf reports from Kyiv.
Video

Video US Detainees Want Negotiators for Freedom in North Korea

The three U.S. detainees held in North Korea were permitted to speak with foreign media Monday. The government of Kim Jong Un restricted the topics of the questions, and the interviews in Pyongyang were limited to five minutes. Each of the men asked Washington to send a representative to Pyongyang to secure his release. VOA’s Carolyn Presutti has our story.
Video

Video Internet, Technology Offer New Tools for Journalists

The Internet and rapidly evolving technology is quickly changing how people receive news and how journalists deliver it. There are now more ways to tell a story than ever before. One school in Los Angeles is teaching the next generation of journalists with the help of a state-of-the-art newsroom. Elizabeth Lee has this report.
Video

Video Turkmen From Amerli Describe Survival of IS Siege

Over the past few weeks, hundreds of Shi'ite Turkmen have fled the town of Amerli seeking refuge in the northern city of Kirkuk. Despite recent military gains after U.S. airstrikes that were coordinated with Iraqi and Kurdish forces, the situation remains dire for Amerli’s residents. Sebastian Meyer went to Kirkuk for VOA to speak to those who managed to escape.
Video

Video West Africa Ebola Vaccine Trials Possible by Early 2015

A U.S. health agency is speeding up clinical trials of a possible vaccine against the deadly Ebola virus that so far has killed more than 1,500 people in West Africa. If successful, the next step would be a larger trial in countries where the outbreak is occurring. VOA's Carol Pearson has more.
Video

Video Survivors Commemorate 70th Anniversary of Nazi Liquidation of Jewish Ghetto

When the German Nazi army occupied the Polish city of Lodz in 1939, it marked the beginning of a long nightmare for the Jewish community that once made up one third of the population. Roughly 200,000 people were forced into the Lodz Ghetto. Less than 7,000 survived. As VOA’s Kane Farabaugh reports, some survivors gathered at the Union League Club in Chicago on the 70th anniversary of the liquidation of the Lodz Ghetto to remember those who suffered at the hands of the Nazi regime.
Video

Video Cost to Raise Child in US Continues to Rise

The cost of raising a child in the United States continues to rise. In its latest annual report, the U.S. Department of Agriculture says middle income families with a child born in 2013 can expect to spend more than $240,000 before that child turns 18. And sending that child to college more than doubles that amount. VOA’s Deborah Block visited with a couple with one child in Alexandria, Virginia, to learn if the report reflects their lifestyle.
Video

Video Chaotic Afghan Vote Recount Threatens Nation’s Future

Afghanistan’s troubled presidential election continues to be rocked by turmoil as an audit of the ballots drags on. The U.N. says the recount will not be completed before September 10. Observers say repeated disputes and delays are threatening the orderly transfer of power and could have dangerous consequences. VOA correspondent Meredith Buel reports.

AppleAndroid