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In a moving address at the opening session to the 21st Session of the Conference of the Parties (COP21), President Barack Obama called on world leaders and delegates assembled in the plenary hall at Le Bourget for resolve in the coming two weeks of negotiations, keeping in mind the long-term implications of the results.

In a creative attempt to protect California's waning water supply, Los Angeles released 20,000 "shade balls" into the LA Reservoir. According to researchers, shade balls could reduce surface evaporation by 85 to 90 percent, protect water quality by preventing chemical reactions triggered by sunlight, deter birds and other wildlife, and protect the water from rain and wind-blown dust. 

The Los Angeles Department of Water and Power has now dumped 96 million balls into local reservoirs to reduce evaporation and block sunlight from encouraging algae growth and toxic chemical reactions. The balls are coated with a chemical that blocks ultraviolet light and helps the spheres last as long as 25 years.

The Paris climate accord heralds a new era for the global economy, with a wide range of investors and industries now likely to seek ways to avoid carbon risks and adopt less carbon-intensive ways of doing business, experts say. Secretary of State John Kerry says the deal will be a net job creator and sends a powerful message to the marketplace. Nancy Pfund, managing partner of DBL Partners, agrees. "It's very hard to go backward from something like this. People are boarding this train, and it's time to hop on if you want to have a thriving, 21st-century economy," she says.