Over-population is a rising problem across the world and in many countries making housing people difficult and increasing poverty along with housing prices. It is being solved through the removal of forests to create suitable spacing for houses.

An idea would be to create a safe design where houses can be built on top of trees making 'tree houses' no longer just for children but suitable living areas for people instead. I feel this would create houses for people and would help the environment as well which would be solving two problems at once to an extent.

this can be done through using the main trunk of the tree to support the load of the house and having the branches attach to nearby houses to further support the house and transfer the weight to the ground. Although this may not be suitable for everyone, it's an unusual idea which can help slightly.