The planetary ecosystem is a tangled web, Heavenfall...what seems direct might be obvious yet not guilty, and what is very subtle yet cumulative might not be observable, yet guilty...or all might be acting together. It is what it is. People won't stop doing damaging things, and the mass of humanity causes what it does even without doing more than eating and breathing...
However, as one disappears, others expand to fill the gap created. Ironic that the frog's name is what it is...