Question

What are renewable and non-renewable sources?

Hint:

Future energy security depends on shifting from non-renewable to renewable sources.

Answer 1

Step 1: Renewable Sources 
These are sources of energy that can be naturally replenished within a short period of time. They are sustainable and eco-friendly. Examples: Solar energy, wind energy, hydro power, biomass, geothermal energy. 
Step 2: Non-Renewable Sources 
These are sources of energy that cannot be replenished quickly. They take millions of years to form and will eventually be exhausted. Examples: Coal, petroleum, natural gas, nuclear fuels. 
Step 3: Comparison Table 

Renewable Sources	Non-Renewable Sources
Inexhaustible and sustainable.	Limited and exhaustible.
Do not pollute the environment.	Cause pollution and greenhouse gases.
Examples: Sunlight, wind.	Examples: Coal, petroleum.

Step 4: Importance 
Renewable sources are the key to sustainable development. 
Non-renewable sources currently supply most of the world’s energy but are causing climate change. 
Final Answer: 
Renewable sources are naturally replenished energy sources like solar and wind, while non-renewable sources are limited and include coal, petroleum, and natural gas.