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This photograph shows green photosynthetic cyanobacteria growing and mineralizing in the sand-hydrogel framework. The living material has similar strength to cement-base mortar. College of Engineering and Applied Science at Colorado University Boulder / EurekAlert!

Cement is a remarkable building material; it's cheap, durable and readily available. However, its production is a leading source of carbon dioxide emissions, coughing up 2.8 gigatons of emissions every year, as Advanced Science News reported.

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A dog named Sheba runs out of a duck pond in Prospect Park Sept. 2, 2007 in the Brooklyn borough of New York City.

Daniel Barry / Getty Images

The toxic algae blooms that have killed dogs in Texas, North Carolina and Georgia have been detected in three New York City parks. Parents and pet owners are being warned to keep their kids and dogs away from the infected water, which can be fatal when dogs lap it up, swallow it while swimming, or lick it off their own fur, as the New York Times reported.

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Button mushrooms (Agaricus bisporus) growing in a green space in the city of Chemnitz, Germany. Mars 2002 / CC-BY-SA 3.0

The latest renewable energy breakthrough took place over a lunch.

Sudeep Joshi, a postdoctoral fellow at Stevens Institute of Technology, told BBC News that he and some colleagues were discussing the problem of cyanobacteria. These are organisms that can convert sunlight into electric current. The problem? They don't live long enough on artificial lab equipment for researchers to be able to take much advantage of that fact.

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A Lake Worth lifeguard wearing a protective mask asks a surfer to exit the ocean as Palm Beach County officials announced that all county beaches are closed due to red tide affecting coastal areas on October 4, 2018 in Lake Worth, Florida. Joe Raedle / Getty Images

The same red tide choking Florida's Gulf coast has spread to waters off Miami-Dade and Palm Beach counties, forcing the closure of many popular beaches on Thursday and leaving hundreds of dead fish in its wake, according to local reports.

This is the first time in decades the toxic algae has affected both of Florida's coasts at the same time, the Associated Press reported.

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