David Keith reviews the science and technology of solar geoengineering, examining its potential to reduce climate risks, associated new risks, and current uncertainties. He proposes integrating

David Keith reviews the science and technology of solar geoengineering, examining its potential to reduce climate risks, associated new risks, and current uncertainties. He proposes integrating solar geoengineering into a comprehensive 4D climate policy, which includes emissions cuts, carbon removal, and adaptation.

A distinguished expert, David Keith is a Harvard Professor of Applied Physics and Public Policy. He founded Carbon Engineering, a company developing technology to capture CO2 for carbon-neutral fuels. Best known for his work on solar geoengineering, he led Harvard's Solar Geoengineering Research Program. He has authored over 200 academic publications and "A Case for Climate Engineering."

The session was moderated by Greg Bronevetsky.

The Association of Space Explorers (ASE) united astronauts from multiple nations, including Germany, Japan, US, and India, to send a vital message of solidarity, hope, and collaboration to

The Association of Space Explorers (ASE) united astronauts from multiple nations, including Germany, Japan, US, and India, to send a vital message of solidarity, hope, and collaboration to political leaders concerning climate change. This powerful initiative aims to inspire action during a crucial time.

For deeper insight into the Overview Effect and astronaut experiences, explore "OVERVIEW" on YouTube and "PLANETARY," available on iTunes. The video was produced by astronaut Ron Garan and the award-winning Planetary Collective, in association with Daria Lopez-Alegria of Space Bridges.

Learn more at weareplanetary.com.

After rowing the Atlantic and witnessing extensive plastic pollution, Met Office scientist Kate Salmon and her "Row for the Ocean" crew founded Plastic Free Exeter. Their goal is to make Exeter

After rowing the Atlantic and witnessing extensive plastic pollution, Met Office scientist Kate Salmon and her "Row for the Ocean" crew founded Plastic Free Exeter. Their goal is to make Exeter the UK's largest single-use 'plastic-free' city by 2020, demonstrating how local action can unite communities in addressing environmental challenges.

This talk, presented at TEDxExeter 2019 under the theme "The Art of the Possible," encourages reflection on our shared future amidst societal divisions. Learn more about TEDxExeter at [www.tedxexeter.com](http://www.tedxexeter.com). For details on TEDx events, visit [https://www.ted.com/tedx](https://www.ted.com/tedx).

The "membership economy" is profoundly transforming business, comparable to the industrial revolution, states Silicon Valley consultant Robbie Kellman Baxter. This model shifts the consumer-brand

The "membership economy" is profoundly transforming business, comparable to the industrial revolution, states Silicon Valley consultant Robbie Kellman Baxter. This model shifts the consumer-brand relationship from transactional to relational, emphasizing access over ownership and delivering a "forever promise."

While not a new concept—Charles Dickens used subscriptions—modern technology allows businesses to build these ongoing relationships with unprecedented reach. This shift, exemplified by Netflix's success over Blockbuster, prioritizes consistent value and customer certainty. Baxter, author of "The Membership Economy," details this move from one-time payments to recurring revenue and multi-directional communication.

Discover more: Big Think YouTube and Big Think Edge.

Money is an agreement, not inherently valuable. Charles Eisenstein explores this concept, arguing that money often fails to address fundamental human needs. His work, including the book