What standards can local and national governments establish to improve the environment? Check all that apply. building codes
laws for recycling
auto-efficiency standards
tax credits for toxic dumping
tax deductions for high energy usage
tax credits for alternative sources of energy

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.

Migration people get up and go cause they feel it is best for them