【夏、現役の追撃】駿台上本町校21【目の保養】

it has become customary for - to accuse environmentalism of permanently crying "wolf!" why those sceptics ask
is it all so urgent now, given the relative ease with which the earth seems to have withstood most of the damage
inflicted on it over the last 20 years?

it 形式 Subject
has become V verb
customary　C
accuse　V　非難する
is it all so urgent now,
all 強意
so　そんなに、それほど
given / considering
ease with which / relatively easily
withstood　耐えた
cry wolf　狼少年、嘘をついて世間を騒がせる
so urgent now　それほど急を要する
enveronmentalists　がいっているほど急を要する
inflict A on B　AをBに与える / impose