premise: fossil fuels are a nonrenewable resource sent2: if something increases something else then decreasing that something will decrease that something else sent3: electrical power is a kind of power sent4: burning something is a kind of action sent5: to decrease something means to reduce that something sent6: natural gas is used for generating electricity by burning in a power plant sent7: if something causes an increase in something else then that something produces that something else sent8: if something occurs by performing an action, then that action is required for that something to occur sent9: as the use of renewable resources increases , use of nonrenewable resources will decrease.
hypothesis: substance y and substance z are elements