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Our Axios Voices conversation on geoengineering.

The Paris climate agreement and some nations, including the U.S, recognize certain geoengineering projects as potentially legitimate, but the legal status of technologies to deflect the sun's radiation is wholly undefined despite carrying geopolitical and moral risks.

Why it matters: Solar radiation management, in which the sun's light is reflected by mirrors or particles deployed in the atmosphere, could have terrible environmental and societal consequences. It could be weaponized and lead to conflict between nations. Even if the risks are overblown, merely talking about and conducting research into geoengineering may weaken support for limiting emissions via renewable energy and conservation, methods we know work. When geoengineering is presented to people as a potential solution to climate change, their support for mitigation measures falls.

Bottom line: We need responsible communication. Even if solar radiation management never becomes a physical reality, how it is portrayed by scientists, governments, and corporations could have a profound effect on how the world addresses climate change.

Other voices in the conversation:

Go deeper

Hill votes will make global waves

President Biden addresses the UN General Assembly on Sept. 21, 2021 in New York City. Photo: Eduardo Munoz-Pool/Getty Images)

This epic week for President Biden on Capitol Hill is even bigger than his domestic agenda.

Why it matters: Biden has anchored his entire strategy for foreign affairs on the notion that "America is back." What that means in practice is that Biden needs to prove democracy works to rally America’s liberal allies against rising authoritarians.

60 mins ago - World

German election: Exit polls show close race to succeed Angela Merkel

SPD leader Olaf Scholz. Photo: Alex Kraus/Bloomberg via Getty Images

BERLIN — The first exit poll from Sunday's German elections showed the center-left Social Democrats (SPD) and the center-right Christian Democrats (CDU) in a dead heat at 25%, leaving the race to succeed Angela Merkel too close to call.

The state of play: A second exit poll showed the SPD narrowly ahead. That's the one televisions displayed at SPD headquarters in Berlin, where the room erupted into cheers. Official results will roll in throughout the evening.

Abbott says he'll hire Border Patrol agents who whipped at migrants

Texas Gov. Greg Abbott (R) on Sunday defended the actions of U.S. Border Patrol agents who charged at Haitian migrants on horseback, blaming the Biden administration for not preventing them from crossing the border.

Why it matters: Abbott's remark on "Fox News Sunday" comes amid increased backlash over the incident, with President Biden saying, "I promise... those people will pay,” and the Department of Homeland Security launching an investigation.