Quantcast
Environmental News for a Healthier Planet and Life

Help Support EcoWatch

David Suzuki: Climate Deniers Are Wrong ... CO2 Emissions Are Wreaking Havoc on the Planet

Popular
David Suzuki: Climate Deniers Are Wrong ... CO2 Emissions Are Wreaking Havoc on the Planet

Life evolved to live within limits. It's a delicate balance. Humans need oxygen, but too much can kill us. Plants need nitrogen, but excess nitrogen harms them and pollutes rivers, lakes and oceans. Ecosystems are complex. Our health and survival depend on intricate interactions that ensure we get the right amounts of clean air, water, food from productive soils and energy from the sun.

Water flowing to the ocean from the Greenland ice sheet.macaroni2552 / Imgur

Climate change deniers either willfully ignore or fail to understand this complexity—as shown in their simplistic argument that carbon dioxide (CO2) is a beneficial gas that helps plants grow and is therefore good for humans.

Industry propagandist Tom Harris of the misnamed International Climate Science Coalition writes, "Grade school students know CO2 is not pollution; it is aerial fertilizer." He adds, "Increasing CO2 levels pose no direct hazard to human health."

The unscientific Heartland Institute-ICSC study he references claims, against all evidence, "Carbon dioxide has not caused weather to become more extreme, polar ice and sea ice to melt or sea level rise to accelerate."

It's a facile argument, designed to downplay the seriousness of global warming and its connection to CO2 emissions and to promote continued fossil fuel use. Deniers like Harris and Patrick Moore in Canada extoll the virtues of burning coal, oil and gas.

It's deliberate deception, rather than an outright lie, as most plants do require CO2 to grow. But overwhelming scientific evidence shows that, along with other greenhouse gases, CO2 causes ocean acidification and fuels climate change, putting humans and other life at risk.

Even its benefit to plants is more complicated than deniers let on. As the website Skeptical Science states, "Such claims fail to take into account that increasing the availability of one substance that plants need requires other supply changes for benefits to accrue. It also fails to take into account that a warmer earth will see an increase in deserts and other arid lands, reducing the area available for crops."

A Stanford University study, published in the Proceedings of the National Academy of Sciences, illustrates the claim's lack of scientific validity. After observing plants grown in California over 16 years, under altered CO2, nitrogen, temperature and water levels, researchers concluded that only higher nitrogen levels increased plant growth, while higher temperatures hindered the plants.

A study in Nature Climate Change concluded that a 1 degree C temperature increase will cause wheat yields to decrease by about five percent, and a French study found higher temperatures negatively affected corn crops.

Another study, published in Science, examined the complexity of CO2 uptake by plants. It found only those associated with particular types of fungi in their roots can take advantage of increased CO2, because the fungi regulate nitrogen plants obtain from soils. Plants such as coniferous trees that associate with ectomycorrhizal fungi can derive benefits from higher carbon dioxide levels, but plants associated with arbuscular mycorrhizal fungi, such as grassland vegetation, can't.

The Imperial College London researchers cautioned that even plants that can take advantage of higher CO2 levels could be harmed by other climate change impacts, such as increased temperature and ozone concentration. Climate change–related droughts and flooding also hinder plant growth.

Burning fossil fuels, creating emissions through industrial agriculture and destroying "carbon sinks" like wetlands and forests that sequester carbon are already affecting the planet in many ways detrimental to the health and survival of humans and other life.

No matter what inconsistent, contradictory and easily debunked nonsense deniers spread, there's no denying climate change is real, humans are contributing substantially to it and it will be catastrophic for all life if we do little or nothing to address it immediately.

Recently, 375 U.S. National Academy of Sciences members, including 30 Nobel laureates, published an open letter stating:

"We are certain beyond a reasonable doubt … that the problem of human-caused climate change is real, serious, and immediate, and that this problem poses significant risks: to our ability to thrive and build a better future, to national security, to human health and food production, and to the interconnected web of living systems."

The evidence is clear and overwhelming: Rapid increases in CO2 emissions are not beneficial. It's past time we started conserving energy and shifting to cleaner sources.

In an ad released by Republican Voters Against Trump, former coronavirus task force member Olivia Troye roasted the president for his response. Republican Voters Against Trump / YouTube

Yet another former Trump administration staffer has come out with an endorsement for former Vice President Joe Biden, this time in response to President Donald Trump's handling of the coronavirus pandemic.

Read More Show Less

EcoWatch Daily Newsletter

Climate Group

Every September for the past 11 years, non-profit the Climate Group has hosted Climate Week NYC, a chance for business, government, activist and community leaders to come together and discuss solutions to the climate crisis.

Read More Show Less

Trending

A field of sunflowers near the Mehrum coal-fired power station, wind turbines and high-voltage lines in the Peine district of Germany on Aug. 3, 2020. Julian Stratenschulte / picture alliance via Getty Images

By Elliot Douglas

The coronavirus pandemic has altered economic priorities for governments around the world. But as wildfires tear up the west coast of the United States and Europe reels after one of its hottest summers on record, tackling climate change remains at the forefront of economic policy.

Read More Show Less
Monarch butterflies in Mexico's Oyamel forest in Michoacan, Mexico after migrating from Canada. Luis Acosta / AFP / Getty Images

By D. André Green II

One of nature's epic events is underway: Monarch butterflies' fall migration. Departing from all across the United States and Canada, the butterflies travel up to 2,500 miles to cluster at the same locations in Mexico or along the Pacific Coast where their great-grandparents spent the previous winter.

Read More Show Less
The 30th First Annual Ig Nobel Prize Ceremony on Sept. 17 introduced ten new Ig Nobel Prize winners, each intended to make people "laugh then think." Improbable Research / YouTube

The annual Ig Nobel prizes were awarded Thursday by the science humor magazine Annals of Improbable Research for scientific experiments that seem somewhat absurd, but are also thought-provoking. This was the 30th year the awards have been presented, but the first time they were not presented at Harvard University. Instead, they were delivered in a 75-minute pre-recorded ceremony.

Read More Show Less

Support Ecowatch