Environmental challenges

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Across
  1. 6. Where common resources are overused because no one power owns them.
  2. 7. A problem so vast, affecting everyone, that it requires international co-operation.
  3. 8. Cheap and readily available energy source, part responsible for the increase in greenhouse gas emissions.
Down
  1. 1. Oceans filling up with waste including plastics and chemicals.
  2. 2. Proposals to reduce and offset (via treaties like Paris 2015) carbon emissions.
  3. 3. Increases in global temperature over time, driven (among other things) by greenhouse gasses.
  4. 4. Resources that do not belong to any one nation (eg, high seas, atmosphere, polar regions, outer space).
  5. 5. Destruction of plant life and ecosystems, which can affect climate change (trees are carbon sinks).