Translate the following English sentence to French:
"It is a serious environmental threat and not only is it a problem, but we are actually subsidising that sector, which is making the situation very much worse."
Il s'agit d'une grave menace environnementale, ce qui constitue un premier problème. Mais en outre, nous subventionnons nous-mêmes ce secteur, ce qui rend la situation encore plus difficile.