Ozone treaty taking a bite out of US greenhouse gas emissions

The Montreal Protocol, the international treaty adopted to restore Earth's protective ozone layer in 1989, has significantly reduced emissions of ozone-depleting chemicals from the United States. In a twist, a new study shows ...

Helium balloons offer low-cost flights to the stratosphere

Using off-the-shelf technology and innovative economics, lightweight helium balloons have started carrying remote-controlled laboratories to the edge of space and back, offering the business case for new types of science ...

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