Far from halting environmental devastation like Thanos intended, the Decimation made it even worse. The above picture is of the Amazon Rainforest after the snap in which half of it vanished off the face of the Earth, a occurrence that loggers could only dream of. This sudden loss of trees caused Earth's temperatures to intensify over a five year period.
Thanos did not destroy anything but intelligent beings. As a ultraradical-Malthusian he believed that there were too many of them compared to resources. His goal was to eliminate half of intelligent beings to make the other half's life better. AFAIK he did not destroy any infrastructure or natural resources. There was even a mention in the Avengers: Endgame that wildlife was recovering on much less populated Earth (I think it was about whales).