Measuring the rate at which we are losing species is as difficult as measuring species in the first place. But we seem to be losing species 1,000 times faster than we should be, at the rate of one per day.
查看答案
According to ExtinctionCrisis.org, many pesticides used are harmful to native fish and amphibian populations which can in turn cause birds to be killed from feeding on those poisoned species.
A. 对
B. 错
Genetic engineering could help increase agricultural yields whilst decreasing the land required for farming and minimizing the use of pesticides and fertilizers. It might also enable us to modify plants and animals the better to adapt to new habitats.
A. 对
B. 错
TheUnitedNationsDeclarationofTheHumanEnvironmentin1972inStockholmdeclares26principlesconcerningthepreservation and enhancementofthehumanenvironment.Amongthem,Principle1declaresthat"Manhasthefundamentalrighttofreedom,equalityandadequateconditionsoflife,inanenvironmentofaqualitythatpermitsalifeofdignityandwell-being,andhebearsasolemnresponsibilitytoprotectandimprovetheenvironmentforpresentandfuturegenerations.Inthisrespect,policiespromotingorperpetuatingapartheid,racialsegregation,discrimination,colonialandotherformsofoppressionandforeigndominationstandcondemnedandmustbeeliminated".
A. 对
B. 错
The cloning biotechnology would enable us to increase stocks of existing species (albeit without increasing the genetic diversity within the species) and even perhaps to bring back species that have already lost the battle.
A. 对
B. 错