Middle East war: why tit-for-tat attacks on gasfields are a major escalation

Strikes on South Pars and Ras Laffan are first time fossil fuel energy production facilities have been hit. Why is it significant?The strikes on so-called upstream gas production facilities by both sides of the Middle East war mark a significant escalation and could have long-term consequences.It is the first time facilities connected to the production of fossil fuel energy have been hit, rather than sites associated more generally with the oil and gas industry.