Size of the word is proportional to how often it appears.
Color is based on authority rank, with red having higher authority, blue lower.
- PhysOrg.com
Words: research, cell, study, development, system
Topics: Global Warming, United States, California, China, Japan
- Science Daily
Words: research, cell, study, development, system
Topics: Global Warming, United States, California, Environmental Protection Agency, Massachusetts Institute of Technology
- Scientific American
Words: energy, fuel, research, cell, electricity
Topics: Global Warming, United States, California, Environmental Protection Agency, Japan
- Treehugger
Words: energy, fuel, emissions, electricity, hybrid
Topics: Global Warming, United States, Environmental Protection Agency, Japan, California
- Environmental News Network
Words: emissions, energy, carbon, fuel, climate
Topics: Global Warming, Environmental Protection Agency, United States, California, Japan
- Earthwire.org
Words: emissions, carbon, energy, climate, fuel
Topics: Global Warming, United States, Environmental Protection Agency, California, European Commission
- BusinessGreen.com
Words: emissions, carbon, energy, fuel, biofuels
Topics: Global Warming, United States, Environmental Protection Agency, California, European Commission
- Grist
Words: emissions, energy, carbon, fuel, climate
Topics: Global Warming, Environmental Protection Agency, United States, California, Barack Obama
- The Engineer Online
Words: engine, fuel, energy, technology, system
Topics: United States, Global Warming, California, BP p.l.c., China
- An Englishman's Castle
Words: co2, climate, carbon, fuel, emissions
Topics: Global Warming, Europe, United States, London, European Commission
- The Breakthrough Institute Blog
Words: emissions, energy, carbon, technology, climate
Topics: Global Warming, United States, China, California, India
- Environmental Science & Technology
Words: emissions, co2, carbon, fuel, research
Topics: United States, California, China, Canada, Beijing
- Hybrid Cars Blog
Words: hybrid, vehicles, fuel, battery, gm
Topics: United States, Environmental Protection Agency, California, Ford Motor Company, Global Warming