Brainstorm

Conservation - Species extinction • Iinvasive species • Poaching • Endangered species 

// little man collecting / protecting the endangered animals

Environmental degradation - Habitat destruction • Invasive species

//An endangered animal, with human characteristics helping protect the endangered species from poachers and deforestation 

Nuclear issues - Nuclear meltdown • Nuclear power • Nuclear weapons • Nuclear and radiation accidents • Nuclear safety • High-level radioactive waste management.

//creature of some sort preventing a nuclear meltdown, with time limits and a limit of resources - robot or alien 

Resource depletion — Exploitation of natural resources 

Consumerism — Consumer capitalism • Planned obsolescence • Over-consumption

Fishing — Blast fishing • Illegal, unreported and unregulated fishing • Overfishing • Shark fining • Whaling

Logging — Deforestation • Illegal logging

Mining — Acid mine drainage • Hydraulic fracturing • Mountaintop removal mining 

// A fishing game, where you destroy whaling ships, and prevent shark fining

Energy Consumption - using less energy, causing a decrease in demand, thus less emissions from the power plant.

// an electric powered creature trying to reach the power plant while conserving energy.