Is Human Activity Really to Blame for Climate Change? How Did Venus Get So Hot?

venusandearth

A recent debate between candidates for Congress in the Wisconsin’s 1st District — U.S. Rep. Paul Ryan, R-Janesville, and Democratic challenger Rob Zerban — included questions about the role of human beings in producing discernible changes in the climate over the last 150 years.

Unfortunately, this question, which is a matter of evidence, analysis and conclusion as all scientific questions are, has become a source of partisan political divide.

The Intergovernmental Panel on Climate Change (IPCC), a scientific body created by the United Nations to inform the UN regarding “scientific, technical and socio-economic information relevant to understanding the scientific basis of risk of human-induced climate change,” has issued five reports on this question since 1990.

These reports are a synthesis of many hundreds of peer-reviewed scientific studies on the issue.

With each successive report — they have been issued in 1995, 2001, 2007 and 2014 — the IPCC has increased the certainty of its conclusions.

The language in these reports has changed from “the balance of evidence suggests a discernible human influence on global climate” (1995) to “most of the observed warming is likely (a greater than 66 percent chance) due to human activities” (2001) to warming “over the last 50 years is very likely (a greater than 90 percent chance) due to human activities” to “It is extremely likely (a 95-100 percent chance) that human influence was the dominant cause of global warming between 1951-2010.”

This makes two things quite clear.

First, that scientists are a skeptical bunch and will move toward increased certainty only as evidence accumulates in favor of that conclusion.

Second, that human-induced global warming is a reality with which we must reckon.

During the debate, when asked if humans have a role in global warming, Ryan answered, “I don’t know the answer to that question. I don’t think science does either.”

He may well be correct in his first response, but he is certainly wrong in his second.

Article by Steve Ackerman and Jonathan Martin who are professors in the University of Wisconsin’s Department of Atmospheric and Oceanic Sciences in Madison, Wisconsin.

The above article was published in the Wisconsin State Journal print edition on October 20, 2014.

The IPCC also says “climate change is not a far-off problem. It is happening now and is having very real consequences on people’s lives. Climate change is disrupting national economies, costing us dearly today and even more tomorrow”, the IPCC states.

Astrobiologist David Grinspoon believes that scientists should look at our neighboring planets to help understand the perils of global warming. “It seems that both Mars and Venus started out much more like Earth and then changed. They both hold priceless climate information for Earth.”

The atmosphere of Venus is much thicker than Earth’s. Nevertheless, current climate models can reproduce its present temperature structure well. Now planetary scientists want to turn the clock back to understand why and how Venus changed from its former Earth-like conditions into the inferno of today.Climate scientists believe that the planet experienced a runaway greenhouse effect as the Sun gradually heated up. Astronomers believe that the young Sun was dimmer than the present-day Sun by 30 percent. Over the last 4 thousand million years, it has gradually brightened. During this increase, Venus’s surface water evaporated and entered the atmosphere.

“Water vapor is a powerful greenhouse gas and it caused the planet to heat-up even more. This is turn caused more water to evaporate and led to a powerful positive feedback response known as the runaway greenhouse effect,” says Grinspoon.

We have to make sure nothing like a runaway greenhouse effect doesn’t get started on Earth. Hopefully, it has not already started.

About Mike Neuman

Identical twin; Long-time advocate of protection of our environment; Married; Father to three sons; Grandfather to one granddaughter; Born and raised in Wisconsin; Graduate of University of Wisconsin; post graduate degrees in agricultural economics and Water Resources Management fro UWMadison; Former School Crossing Guard for City of Madison; Bike to Work for 31 years with Wisconsin Department of Natural Resources; Retired from DNR in 2007; Biked to school crossing guard site 2 X daily for 7 years retiring in 2019; in addition to being an advocate of safeguarding our environment, I am also an advocate for humane treatment of animal, children, and people in need of financial resource for humane living. I am presently a Volunteer for Habitat for Humanity, Madison, Wisconsin. I oppose all long (>500 miles) distance travel (via fossil fuel burning) for nonessential purposes and all ownership of more than one home. I am opposed to militarism in any form particularly for the purpose of monetary gain. I am a Strong believer in people everywhere having the right to speak their minds openly, without any fear of reprisal, regarding any concerns; especially against those in authority who are not acting for the public good?in a timely fashion and in all countries of the world not just the U S.. My identical twin, Pat, died in June 2009. He was fired from his job with the National Weather Service despite having a long and successful career as a flood forecaster with the Kansas City National Weather Service. He took a new position in the Midwest Regional Office in Minneapolis. Unfortunately, Pat’s work for the NWS went sour after he began to see the evidence for concern about rising global temperatures shortly after relocating to Minneapolis, and how they appeared to effect of flooding on the Red River that flows out of Canada before entering the U.S. in North Dakota. . Pat and I conversed on a regular basis with other scientists on the Yahoo Group named “Climate Concern “ and by personal email. The NWS denied his recommendation to give his public presentation o n his research at the “Minneapolis Mall of America” in February 2000, which deeply affected h,im. I will h He strongly believed the information ought be shared with the public to which I concurred. That was the beginning of the vendetta against my brother, Patrick J. Neuman, for speaking strongly of the obligations the federal government was responsible for accurately informing the citizenry. A way great similar response to my raising the issue of too many greenhouse gases being emitted by drivers of vehicles on Wisconsin highway system, my immediate supervisors directed: “that neither global warming, climate change nor the long term impacts upon the natural resources of Wisconsin from expansion of the state highway system were to be any part of my job requirements, and that I must not communicate, nor in a memorandum to all the bureau, shall any person who works in the same bureau I do communicate with me, neither verbally on the phone, by email.

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