Why is solar energy not yet more widely used1. it has been difficult to produce electricity using solar power? 2. fossil fuels are widely distributed and inexpensive3. the process produce dangerous waste products4. sufficient sunlight reaches only a few locations

Solar panels are expensive, they are kept this way by the companies.

The price ranges around $10.000 - $15.000 for an installation. It takes years to get this investment back and in the meantime the batteries need to be changed and power converter need to be maintenance, etc.

your answer is 4. sufficient sunlight reaches only a few locations

tocharian and anatolian were belaved to become extinct during the ninth century. =)