题目内容

A biosphere reserve must have adequate long-term legal ___________. Each biosphere reserve will be large enough to be an effective conservation unit and to accommodate different uses without conflict.

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The distinction between preservation and conservation has ____________ in recent years with growing recognition of the dynamic nature of natural systems, humanity's place in the biosphere, and the need for active human involvement to maintain the integrity of certain ecosystems.

A critical aspect of environmental protection is that it is driven by the values that humans attribute to different aspects of the environment. These values need not be _____________, but the motivating factor for environmental protection is always the prevention of changes to the environment that humans do not want. This is why measures associated with the prevention of unwanted natural changes to ecosystems—like the prevention of coastal erosion or systematic burning in reserves to reduce the risk of wildfires—can be included as environmental protection.

Globalcarbon(C)emissionsfromfossilfuelusewere______gigatonnes(Gt)in2014(or35.9GtofCO₂).

Climatechangereferstochangesintheearth'sclimate,especiallythe_______________intemperaturecausedbyhighlevelsofcarbondioxide (CO₂) andothergases.ItreferstochangeoccurringintheEarth'soverallclimateandinparticularclimates,nowregardedasaresultofhumanactivityandresultinggenerallyinglobalwarming.