题目内容

Human activities increase atmospheric CO₂ levels primarily through the burning of ____________.

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The next most significant greenhouse gas is surface, or low-level, _________.

A carbon footprint is composed of two parts, a primary and _____________ footprint.

An important reason that climate change is so dangerous to species is that the extinction of one animal, organism, plankton, or flora, can cause a __________ effect that impacts all of the species involved in that food web.

InSeptember2019in________,UnitedNationsSecretary-GeneralAntónioGuterreswillconveneaclimatesummit(COP25)tomobilizepoliticalandeconomiceffortsatthehighestlevelpossibletostrengthenclimateactionandambitionworldwide.TheSummit2019willfocusondrivingactioninsixareas;namely,energytransition,climatefinanceandcarbonpricing,industrytransition,nature-basedsolutions,citiesandlocalaction,andresilience.