Fossil fuels are not renewable because they are formed from the remains of ancient plants and animals that have been buried and subjected to heat and pressure over millions of years.

Solar energy is the most abundant renewable energy source because it is the energy that comes from the sun. The sun's energy can be used to generate electricity, heat homes and businesses, and power vehicles.

The renewable energy sector faces a number of challenges, including cost, intermittency, and storage. Cost is a major challenge because renewable energy technologies are often more expensive than traditional fossil fuel technologies. Intermittency is a challenge because renewable energy sources such as solar and wind power are not always available when needed. Storage is a challenge because it is difficult to store large amounts of renewable energy for later use.

There are a number of career opportunities in the renewable energy sector, including solar panel installer, wind turbine technician, hydropower engineer, and many more.

There are a number of benefits to working in the renewable energy sector, including job security, high salaries, and making a positive impact on the environment.

The average salary for a solar panel installer is $35,000-$45,000.

The average salary for a wind turbine technician is $55,000-$65,000.

The average salary for a hydropower engineer is $75,000-$85,000.

To work in the renewable energy sector, you will need a combination of technical skills, problem-solving skills, and communication skills.

Most jobs in the renewable energy sector require at least a bachelor's degree in a related field, such as engineering, science, or business.

There are a number of certifications that are available for people who work in the renewable energy sector, including the NABCEP Solar PV Installer Certification, the AWEA Wind Turbine Technician Certification, and the Hydropower Association's Hydropower Professional Certification.

There are a number of professional organizations that are available for people who work in the renewable energy sector, including the American Solar Energy Society (ASES), the American Wind Energy Association (AWEA), and the National Hydropower Association (NHA).

There are a number of job boards that are available for people who are looking for jobs in the renewable energy sector, including Indeed, Monster, and CareerBuilder.

There are a number of companies that are hiring for jobs in the renewable energy sector, including SolarCity, Tesla, and Vestas.

There are a number of resources that are available for people who are interested in learning more about the renewable energy sector, including the U.S. Department of Energy's website, the National Renewable Energy Laboratory's website, and the American Council on Renewable Energy's website.