Read the following passage carefully : In the present times, green investment and sustainability are priorities in public policy. India has emerged as a global leader at the front of the climate change. India has pledged to seek solutions for the future. The government has contributed to maintain economic growth by implementing various policies and measures relating to sustainable development. Pradhan Mantri Ujjwala Scheme has actively contributed to cleaner air. The Jal Jeevan Mission was launched with the objective of achieving water security. The greenhouse effect is a natural process that warms the Earth's surface, where certain atmospheric gases, known as greenhouse gases, trap heat from the sun and re-emit it, keeping the planet warm enough to support life. In the present times, the issue of greenhouse gases and rising temperature of the Earth are a global concern. On basis of the above passage and common understanding, answer the following questions : (a) Discuss any two steps involved in attaining sustainable development in India. (b) Mention any two factors which challenged the carrying capacity of the environment. (c) Define Greenhouse effect.