Find a peaceful, natural place to study in.
Save paper and minimise printing.
Use scratch and recycled paper for notes and printers.
Instead of buying new textbooks, borrow them. If you need to purchase textbooks, look for used copies or digital versions instead of buying new print editions.
Set up your computer to power-saving mode after just a few minutes of non-use. If you do not need it for a longer period, switch it off completely.