昆虫和病原体是森林生态系统的固有成分，通常其密度相对较低，所造成的损害较小，对树木生长及其活力的影响微乎其微。

Insects and pathogens are integral components of forest ecosystems and normally are present at a relatively low density, causing little damage, and having negligible impact on tree growth and vigour.

youdao

气候变化正在加速造成对生态系统、农业生产力、森林和供水系统不可弥补的损害；

The irreparable damage that is being inflicted on ecosystems, agricultural productivity, forests and water systems is accelerating.

youdao

所有的农业都损害环境，包括你所能想到的一切——砍伐森林，垦荒草原，灌溉的水源，粪肥，拖拉机消耗的燃料，杀虫剂还有化肥等。

All agriculture damages the environment - think of all those felled forests and ploughed-up prairies, all the irrigation water, manure, tractor fuel, pesticides and fertiliser.

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