Generally population growth and technology impact the environment by
lessening "natural" environments and creating more "man made" ones.
Often non-human populations (plants and animals) are affected by these
changes and either adapt or die out in areas with increased population
growth or technological advances. Think of places in your community
where new roads have been built, where vacant lots have becoming houses,
or where any kind of change to the "natural" environment has
occurred.The movie Over the Hedgeis a simplification of this issue.There
have also been more positive impacts recently, in terms of green
energy (solar or wind power, for example) where technology has allowed
for a reduction in the use of natural resourcesin certain communities.
Most smaller stars don't have a radiative zone. In the radiative zone, the material is hot and dense which enables thermal radiation transfers from the core outward though the Sun. This layer is size dependent therefore smaller stars might not have this zone at all.
