The fake fear of climate change is the current boogeyman of our age. Some say we must eliminate some or all of our carbon dioxide (CO2) emissions or the Earth will become uninhabitable. They say we must limit global temperature to a maximum of 2°C. In articles referenced below I show why that is nonsense.
So, what is an ideal temperature? A new study led by Washington State University and published in the Journal of Astrobiology proposes an answer. This study examines exoplanets in the universe. The study is titled: In Search for a Planet Better than Earth: Top Contenders for a Superhabitable World. (Link to full study)
The fact that Earth is teeming with life makes it appear odd to ask whether there could be other planets in our galaxy that may be even more suitable for life. Neglecting this possible class of “superhabitable” planets, however, could be considered anthropocentric and geocentric biases. Most important from the perspective of an observer searching for extrasolar life is that such a search might be executed most effectively with a focus on superhabitable planets instead of Earth-like planets. We argue that there could be regions of astrophysical parameter space of star-planet systems that could allow for planets to be even better for life than our Earth. We aim to identify those parameters and their optimal ranges, some of which are astrophysically motivated, whereas others are based on the varying habitability of the natural history of our planet. Some of these conditions are far from being observationally testable on planets outside the solar system. Still, we can distill a short list of 24 top contenders among the >4000 exoplanets known today that could be candidates for a superhabitable planet. In fact, we argue that, with regard to the search for extrasolar life, potentially superhabitable planets may deserve higher priority for follow-up observations than most Earth-like planets.
Bottom line: The best habitable planets will have a mean surface temperature about 5°C higher than on Earth.
My previous articles on the subject show why reducing CO2 emissions will be a multi-trillion dollar, futile exercise that will send us back to the dark ages :
During the past 10,000 years (the Holocene), Earth experienced several cycles of warming and cooling which exceeded the mythical two degree limit. Civilizations thrived during the warm periods and had a harder time during cold periods.
The latest talking point of progressive politicians, pundits, and activists is that America cannot afford not to spend trillions of dollars to “solve the climate crisis” because global warming is an existential threat. Even a complete elimination of U.S. greenhouse gas emissions would avert only 0.083°C to 0.173°C by year 2100. All climate policies by the US, China, the EU and the rest of the world, implemented from the early 2000s to 2030 and sustained through the century will likely reduce global temperature rise about 0.17°C in 2100.
A doubling of current atmospheric carbon dioxide will produce global warming of just over one degree Celsius. Since carbon dioxide is plant food, such a doubling would make the planet greener and food farming more productive.