About Careers Internship MedBlogs Contact us
Medindia LOGIN REGISTER
Advertisement

Natural Factors are Not the Cause for Global Warming, Expert

by Dr. Enozia Vakil on April 13, 2014 at 4:32 PM
Font : A-A+

 Natural Factors are Not the Cause for Global Warming, Expert

Natural fluctuation in the earth's climate is not the cause of global warming as per analysis of temperature data since 1500.

The study, by McGill University physics professor Shaun Lovejoy, represents a new approach to the question of whether global warming in the industrial era has been caused largely by man-made emissions from the burning of fossil fuels.

Advertisement

Rather than using complex computer models to estimate the effects of greenhouse-gas emissions, Lovejoy examines historical data to assess the competing hypothesis: that warming over the past century is due to natural long-term variations in temperature.

"This study will be a blow to any remaining climate-change deniers," Lovejoy said.

"Their two most convincing arguments - that the warming is natural in origin, and that the computer models are wrong - are either directly contradicted by this analysis, or simply do not apply to it," he said.
Advertisement

Lovejoy's study applies statistical methodology to determine the probability that global warming since 1880 is due to natural variability.

His conclusion: the natural-warming hypothesis may be ruled out "with confidence levels great than 99 percent, and most likely greater than 99.9 percent."

To assess the natural variability before much human interference, the new study uses "multi-proxy climate reconstructions" developed by scientists in recent years to estimate historical temperatures, as well as fluctuation-analysis techniques from nonlinear geophysics.

The climate reconstructions take into account a variety of gauges found in nature, such as tree rings, ice cores, and lake sediments. And the fluctuation-analysis techniques make it possible to understand the temperature variations over wide ranges of time scales.

For the industrial era, Lovejoy's analysis uses carbon-dioxide from the burning of fossil fuels as a proxy for all man-made climate influences - a simplification justified by the tight relationship between global economic activity and the emission of greenhouse gases and particulate pollution, he said.

"This allows the new approach to implicitly include the cooling effects of particulate pollution that are still poorly quantified in computer models," he added.

The study is published online in the journal Climate Dynamics.

Source: ANI
Advertisement

Advertisement
News A-Z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
What's New on Medindia
Baldness can be Cured and Prevented: let us see How!
Drinking Beer or Wine Every Day Could Cause Age-related Diseases
Low-Calorie Diet for Diabetes
View all
News Archive
Date
Category
News Category

Medindia Newsletters Subscribe to our Free Newsletters!
Terms & Conditions and Privacy Policy.

Most Popular on Medindia

Sinopril (2mg) (Lacidipine) Drug Side Effects Calculator Find a Doctor Noscaphene (Noscapine) Pregnancy Confirmation Calculator Iron Intake Calculator Blood - Sugar Chart Blood Donation - Recipients Find a Hospital Loram (2 mg) (Lorazepam)
This site uses cookies to deliver our services. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Use
open close
ASK A DOCTOR ONLINE