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serious problem the more serious problems most serious problems the most serious problems
so is it so it is nor it is nor is it
referred to being referred to be refer to being refer to be
was not were not being were not was no to be
are not were not hadn't been wouldn't be
list forbid handle investigate
social environmental cultural universal
solving being solved having solved solved
don’t; will be won’t; isn’t won’t; is don’t; won’t be
list forbid handle investigate
Legislation and government intervention. The industry' s understanding and support. The efforts of environmental health professional. The cooperation of ecologists, environmental activists and conservationists.
are not were not hadn't been wouldn't be
making remained keeping left
Legislation and government intervention. The industry’s understanding and support. The efforts of environmental health professionals. The cooperation of ecologists, environmental activists and conservationists.
aimed on focused on intended for commented on
threatened being threatened threatening to be threatened
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