Earth
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We summarize the week's scientific breakthroughs every Thursday.
- 			 Climate ClimateDuring El Niño, the tropics emit more carbon dioxideEl Niño increases carbon emissions from the tropics — mimicking future climate change. 
- 			 Animals AnimalsNew deep-sea sponge could play a starring role in monitoring ocean healthA new species of sponge that dwells on metal-rich rocks could help scientists track the environmental impact of deep-sea mining. 
- 			 Agriculture AgricultureMuch of the world’s honey now contains bee-harming pesticidesA controversial group of chemicals called neonicotinoids has a global impact, tests of honey samples show. 
- 			 Plants PlantsJosé Dinneny rethinks how plants hunt for waterPlant biologist José Dinneny probes the very beginnings of root development, which may have important implications for growing food in a changing climate. By Susan Milius
- 			 Chemistry ChemistryChong Liu one-ups plant photosynthesisChong Liu mixes bacteria and inorganics into systems that can generate clean energy better than a leaf. 
- 			 Environment EnvironmentRadioactive material from Fukushima disaster turns up in a surprising placeRadioactive cesium is reaching the ocean through salty groundwater. 
- 			 Oceans OceansCastaway critters rafted to U.S. shores aboard Japan tsunami debrisResearchers report finding 289 living Japanese marine species that washed up on American shores on debris from the 2011 East Japan earthquake and tsunami. 
- 			 Climate ClimateTropical forests have flipped from sponges to sources of carbon dioxideAnalyses of satellite images suggest that degraded forests now release more carbon than they store. 
- 			 Environment EnvironmentThe way poison frogs keep from poisoning themselves is complicatedGaining resistance to one of their own toxins forced some poison dart frogs to make other genetic tweaks, too. 
- 			 Earth EarthPlate tectonics started at least 3.5 billion years agoAnalyses of titanium in rock suggest plate tectonics began 500 million years earlier than thought. 
- 			 Earth EarthPlate tectonics started at least 3.5 billion years agoAnalyses of titanium in rock suggest plate tectonics began 500 million years earlier than thought. 
- 			 Earth EarthIntense storms provide the first test of powerful new hurricane forecast toolsFrom Harvey to Maria, this year’s powerful hurricanes are giving scientists’ latest forecasting tools a trial by fire.