Read the passage carefully and answer the question. Water is a precious resource essential for all life on Earth. However, as our population grows and climate change brings more unpredictable weather patterns, water scarcity becomes a pressing concern. Water scarcity is a growing problem worldwide, affecting billions of people. Many regions face droughts, while others struggle with the unequal distribution of water resources. As a result, finding innovative ways to conserve and manage water is crucial. Water harvesting is a vital solution that can help address this challenge. Water harvesting is a method of collecting and storing rainwater for various purposes. It involves capturing rainwater that falls on rooftops, surfaces, and land, then storing it for later use. This ancient practice has been used by civilisations throughout history and remains relevant today. There are various rainwater harvesting systems, each tailored to different needs. The most common types include rooftop harvesting, where rainwater is collected from rooftops and stored in tanks, and surface runoff harvesting, which captures rainwater from paved surfaces and directs it into storage tanks or underground reservoirs. By capturing rainwater, we reduce the need for energy-intensive water treatment and transportation processes. This leads to lower carbon emissions and a reduced environmental footprint. Which statement is correct according to the passage?

1. Rainwater harvesting is a modern practice developed in the 20th century.
2. Water scarcity is a global issue affecting billions of people.
3. Water harvesting can only be done in regions with heavy rainfall.
4. Climate change reduces the importance of water management.