This can be done ` ` safely and sensibly , '' the chief executive of BP says . Measures must be put in place to limit the risk of future earthquakes , government says . Fracking was halted last year after it caused two small tremors in northwestern California . `` They are not life-threatening events or damage-inducing events , but they do cause concern , so as a consequence the fracking was suspended , '' he said . Opponents : It 's a dirty process , and promises of cheap , abundant oil are ` ` deluded ''
This can be done ` ` safely and sensibly , '' the chief executive of BP says . Measures must be put in place to limit the risk of future earthquakes , government says . Fracking was halted last year after it caused two small tremors in northwestern California . Opponents : It 's a dirty process , and promises of cheap , abundant oil are ` ` deluded ''