d.
All of the above
One of the best example of environmental technology that we are currently using is the solar light energy. IT took its electricity in a sun and accumulate those energies into a solar technology. Then after that it can already light the whole house or makes your appliances working without using the current electricity provided by the electric Companies. Second is the water filter technology. IT collects water from the rain then filter it and can be use in doing the household chores like laundry, washing plates, etc.
