In his eagerness to draw quick profit from the trees, he (man) has cut them down in large numbers, only to find that with them he has lost the best friends (who) he had.
人类急于从树木身上尽快得到利益,就大量砍伐树木,结果却发现树木砍掉后,人类就失去了最好的朋友。
And there were some who engaged in the rampant exploitation of consumers to turn a quick profit no matter who was hurt in the process.