Related topics: nasa

Four most polluted national park sites are in California

A couple years ago, as part of the Sierra Club's Outdoors for All campaign, Roberto Morales took a group of low-income Los Angeles area residents north to Sequoia National Park to help with a forest restoration project.

Russia ready to 'fight' for space tourism supremacy

After a decade-long hiatus, Russia is relaunching an ambitious bid for dominion over the world's budding space tourism industry, jostling with zealous billionaires, the United States, and rising China.

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