A
Despite of the heavy rainfall, the river didn’t overflow its banks.
Despite the heavy rainfall…(without of)
The reason why many animals are disappearing are habitat loss and pollution.
IS habitat loss (agreement with the reason)
Many species are at risk of extinction due to they are losing their habitats.
due to losing their habitats или because they are losing…(DUE TO+ gerund/noun)
Having been exposed to pollution for years, the effects on wildlife was devastating.
Having been exposed to pollution for years, wildlife suffered devastating effects.(not effects have been exposed)
It is essential that every country take measures to protect nature, even if it will cost a lot.
…take measures… even if it costs a lot. (+s, if+present simple)
The damage caused by deforestation is irreversible, unless governments will act immediately.
unless governments act immediately(unless+present simple)
The forest, that was once untouched, are now being cleared for agriculture.
The forest, which was once untouched, is now being cleared.(commas, therefore which, forest IS)
The project aims to restore the wetland, as well as protecting local species.
as well as protect local species или as well as to protect (NOT GERUND)
Having been hunted for centuries, the survival of the rhino depend on conservation programs.
…the survival … depends on… (also rhino is the subject of hunting), so rhino depends on conservation programs
The government has been accused of ignoring environmental laws, which is considered as a serious violation.
which is considered a serious violation (without as)
If the ice caps were to melt completely, sea levels will rise by several meters.
sea levels would rise
Not only the climate is changing, but also biodiversity is declining.
Not only is the climate changing, but also biodiversity is declining. (INVERSION)
Being a keystone species, the role of the wolf in the ecosystem are often underestimated.
…the role … is often underestimated (also wolf is the main subject)
The data suggests that deforestation leads to climate change, which is alarming.
The data suggest (singular - datum)
The birds migrate every year to warmer regions, avoiding to freeze during winter.
avoiding freezing
Hardly had they planted the trees than the storm destroyed them.
Hardly had they planted the trees when the storm destroyed them.
The soil, enriched with nutrients by worms, making it fertile for crops.
makes it fertile / …worms, is made fertile
What makes this species unique are its ability to survive in extreme conditions.
What makes… is its ability…
Although being very effective, the new filter system was not installed in time.
Although very effective…
The government is considering to ban single-use plastics next year.
considering banning (consider+gerund)
Not having enough evidence, the case against illegal logging was dismissed.
Not having had enough evidence, the authorities dismissed… (subject is authorities)
The river has been polluted for decades, and it is likely to have been affecting fish populations.
…to have affected fish populations
Scientists warn about the consequences of global warming, but many people still doubt that it’s real.
warn of the consequences (not about)
The oil spill, having spread across the coast, it led to massive bird deaths.
The oil spill, having spread across the coast, led to massive bird deaths.(NO IT)
It was not until the forest was destroyed when people realized its value.
…that people realized its value