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A new study published in Nature’s Scientific Reports by researchers at the Danish National Space Institute at the Technical University of Denmark (DTU) and The Hebrew University of Jerusalem suggests that the Sun’s activity in screening cosmic rays affects clouds and, ultimately, the Earth's energy budget with concomitant climatic effects. Science editor David Whitehouse interviews Professor Henrik Svensmark, one of the study's authors.

We need to rethink everything we know about global warming New calculations show scientists have grossly underestimated the effects of air pollution Date: January 22, 2019 Source: The Hebrew University of Jerusalem Summary: New research shows that the degree to which aerosols cool the earth has been grossly underestimated, necessitating a recalculation of climate change models to more accurately predict the pace of global warming. For a while now, the scientific community has known that global warming is caused by humanmade emissions in the form of greenhouse gases and global cooling by air pollution in the form of aerosols. However,...

Henrik Svensmark on Global Warming (part 1)Question: What could a climate scientist bring to the debate among physicists over the interaction of cosmic rays with the Earth’s atmosphere? Answer: the coffee. Physicists have long maintained that the question of climate change was properly within the realm of physics rather than that of those glorified weathermen who call themselves “climatologists.” Last week we got confirmation of that. It came in the form of a study by physicists in Switzerland .  The study, which was published in the prestigious peer-reviewed science publication Nature, gave support to an alternative theory of climate change...

As the world gathered in the Danish capital for the UN Climate Change Conference, more than 50 scientists, businessmen and lobby groups met to discuss the arguments against man made global warming. Although the meeting was considerably smaller than the official gathering of 15,000 people meeting down the road, the organisers claimed it could change the course of negotiations. Professor Henrik Svensmark, a physicist at the Danish National Space Center in Copenhagen, said the recent warming period was caused by solar activity. He said the last time the world experienced such high temperatures, during the medieval warming period, the Sun...

"We're experiencing the deepest solar minimum in nearly a century," says Dean Pesnell of the Goddard Space Flight Center, "so it is no surprise that cosmic rays are at record levels for the Space Age [i.e. past 50+ years or so -etl]." Galactic cosmic rays come from outside the solar system. They are subatomic particles--mainly protons but also some heavy nuclei--accelerated to almost light speed by distant supernova explosions. Cosmic rays cause "air showers" of secondary particles when they hit Earth's atmosphere; they pose a health hazard to astronauts; and a single cosmic ray can disable a satellite if it...