How do I make a sustainable/eco-friendly house?

For my school project, I need to design a house (with gardens and insides – such as low energy lightbulbs etc.) and I need some ideas to make it the most ecofriendly and sustainable house possible.
It’s a round house (which keeps the heat in) with a thatched roof.
Can anyone suggest anything else?

Any help will be much appretiated!
Thanks,
Lisa.Rr x

What makes a sustainable housing development?

Eg. the area should have good facilities and public services …
any more (: ?

How many trees are killed to make paper, and how much does recycling reduce that?

Just wondering, because when I see big stacks of paper and paper being wasted, I imagine trees and animals suffering for our needs. Also I was wondering how recycling helps out as well.

How green is your company’s business?

In other words, has your company implemented sustainable development and how it is going?