You can't remove any products from the nature. It is illegal.

A. You will support local community if you stay in locally owned accommodation and buy products from local people.

B. You will support local community unless you stay in locally owned accommodation and buy products from local people.

C. You stay in locally owned accommodation and buy products from local people because you will support local community.

D. You stay in locally owned accommodation and buy products from local people only if you will support local community.

A. You should try to limit the use of natural resources unless they are running out in many tourist destinations.

B. Because you try to limit the use of natural resources, they are running out in many tourist destinations.

C. You should try to limit the use of natural resources, so they are running out in many tourist destinations.

D. Natural resources are running out in many tourist destinations, so you should try to limit their use.

A. You don't have to educate yourself about the destination you are visiting by reading guidebooks and travel articles.

B. You aren't required to educate yourself about the destination you are visiting by reading guidebooks and travel articles.

C. You should educate yourself about the destination you are visiting by reading guidebooks and travel articles.

D. You may object to educating yourself about the destination you are visiting by reading guidebooks and travel articles.

A. We don't allow the local people to hunt endangered species for our consumption, so they will become extinct sooner.

B. If we allowed the local people to hunt endangered species for our consumption, they would become extinct sooner.

C. We don't allow the local people to hunt endangered species for our consumption unless they will become extinct sooner.

D. They will become extinct sooner if we don't allow the local people to hunt endangered species for our consumption.

A. Tourists are free to learn about the vital eco-systems before arriving.

B. It is optional for tourists to learn about the vital eco-systems before arriving.

C. Tourists are not required to learn about the vital eco-systems before arriving.

D. Tourists are required to learn about the vital eco-systems before arriving.

A. Unless those areas are not damaged or destroyed, they will be available to future generations.

B. Because those areas are damaged or destroyed, they will not be available to future generations.

C. To keep them available to future generations, those areas must not be damaged or destroyed.

D. If damaged or destroyed, those areas will not be available to future generations any longer.