However, oil speculators searching for fossil fuels dig much deeper into the earth's crust.
(oil speculators searching for fossil fuels; dig; much deeper; into the earth's crust) Context(oil speculators searching for fossil fuels dig,List([9, 55))):(oil speculators; searching; for fossil fuels)
oil speculators searching for fossil fuels dig,List([9, 55))
oil speculators searching for fossil fuels oil speculators
dig searching
much deeper into the earth's crust
for fossil fuels