How does the author use foreshadowing in Brokeback Mountain?

The contrast between the dirty sheep and the meadow flowers seems to foreshadow the love that will grow between the two men as well as the prejudice their relationship will inspire.

This foreshadowing is reinforced when Proulx juxtaposes the “sweetened” cold air of the mountain on their first morning with the phallic “rearing lodgepole pines . . . massed in slabs of somber malachite.” When Ennis and Jack begin their sexual relationship, Proulx captures its harsh and exhilarating duality when she describes Jack and Ennis as “flying in the euphoric, bitter air” on the mountain.