critical mass - the minimum mass of fissionable material that will support a sustaining chain reaction.
crop dusting - the application of pesticides to plants by a low-flying plane.
"But I think it's reaching a little bit more of a critical mass. At some point you've just got to look at things realistically and realize we're not leaving much of a legacy for our grandchildren if we don't address these issues." ...
 See also: Climate, Condition, National, Fuel, Fossil fuels
  
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