Improved transportation systems have resulted in decreased death rate increased greenhouse gases reduced dependence on nonrenewable resources increased pollution easy movement of people, products, and ideas

The correct answers are:

- increased greenhouse gases;

The transportation system is one of the biggest emitters of greenhouse gases into the atmosphere, and this is due to the combustion of the fossil fuels, the end result being huge amounts of CO2 released in the air.

- increased pollution;

The energy sources used for the transportation systems are in general very damaging for the environment as they are letting out as a side product lots of pollutants.

- Easy movement of people, products, and ideas;

With the development of the transportation systems, the movement around the globe has become very easy and quick, and that has contributed to constant communication between people from all over the world, exchanging goods, ideas, technologies, as well as migration.