For this reason black holes are invisible to the eye, as lightless as the empty, dark space surrounding them. Scientists know they exist not because they can see an actual hole, b ...

We've all probably been guilty of this recycling no-no at least once — discarding a disposable coffee cup or food takeout container in our bin. While you may be thinking you're doing your part ...

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Learn how the climate crisis impacts our health, our weather, our food supply, and our coastal cities – and what we can do to help reverse it.

See the pros and cons of everything from recycling to zero-waste – and find tips to reduce the trash and plastic that goes in landfills and incinerators.

Follow the latest stories about animals near and far, including wildlife conservation, research news, newly discovered species, and more.

Learn about conservation efforts, the species we've lost, and the success stories of species that have been spared from extinction. Are Orcas Endangered? Conservation Status and Threats Are ...

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Learn what business and industry are doing to take responsibility for their impact on the planet.

Find the latest scientific discoveries, academic studies, environmental research news, and breakthroughs in green tech and innovation.

Lloyd Alter has been an architect, real estate developer, and prefab entrepreneur. He now teaches Sustainable Design at Ryerson School of Interior Design. Alter has been writing for Treehugger ...