With a growing population and increasing demand, some countries are trying to manage water shortages by using more water to irrigate crops, while others are resorting to drastic measures.
Al Jazeera’s Samir Khan, reporting from London, describes the consequences for some communities as “disaster for the world’s poorest”.
He says water shortages and population growth have become a huge factor in the fight for scarce water resources.
The UN says at least 1.4 billion people in the world have access to water.
About half of those in the West have access.
In Asia, the situation is worse.
China, Vietnam and India are the biggest consumers of water.
Alias, the Economist, says that in 2030 the world will need a quarter of its water supply from non-fossil fuels.
We have to make up the shortfall, according to the United Nations.
This is why it is so important for countries to understand the implications of climate change.
The water scarcity in China, for example, is caused by a lack of rain and drought.
It is also caused by an increase in population, which is growing rapidly and which will increase the pressure on water resources for many countries.
We also need to realise that climate change is one of the major reasons for the rapid increase in human population in the last few decades.
So the main challenge of the 21st century is to find new ways to use water in a sustainable way.
In China, it is increasingly difficult to find water sources.
The state-run China National Petroleum Corporation (CNPC) has said it will be forced to increase the use of water by as much as 25% by 2030.
Some countries, such as the Philippines, have been forced to use more water than their water use needs to provide for their people and infrastructure.
The government says it is not about “saving” water, but about ensuring it is used for its full economic and social potential.
Water scarcity in Asia The region’s water scarcity is also linked to a lack or shortage of technology.
As populations grow, many countries are turning to technologies that could improve water quality.
For example, water-saving technology can be applied to tap wells and pipes to help reduce water wastage.
Another trend is to develop and implement technology that can reduce the use and consumption of chemicals and fertilisers.
A report published in the journal Nature Climate Change says that the use, waste and pollution of chemicals is increasing.
According to the report, the use by China and the Philippines of chemical fertilisers is increasing by up to 50%.
China is also developing technologies to reduce the amount of water that it uses for irrigation and building water infrastructure.
In Africa, more people are now living in cities, but the water situation is not so good.
In some areas, such a lack in access to natural resources and poor management of water resources is making it harder to build up cities and develop new water-based industries.
Alarming water shortages have also resulted in the rise of new diseases such as diarrhoea and malaria.
In many countries, particularly in Africa, the prevalence of diseases is rising due to climate change and increasing populations.
The report says that some of the biggest problems in the developing world include food shortages and drought, and lack of access to sanitation.
Some governments are also investing in water-intensive industries to reduce their water bills.
Some are also planning to increase consumption of renewable energy, such the solar energy.
Climate change and water scarcity are the major factors behind the world facing the most water shortages in the 21th century.
The International Energy Agency says the global demand for water is rising at the fastest rate on record.
This means that countries and regions are relying on water to meet their needs.
We need to ensure that water is available in a cost-effective way, according the report.
Water resources and climate change Al Jazeera spoke to experts from the United States, China, India, the Philippines and the United Arab Emirates.
We asked them about the main impacts of climate changes and the impacts of water scarcity on the world.
Alistair McGovern, professor of international studies, University of California, Berkeley, and chair of the Climate Change and Sustainable Development Programme at the University of Oxford, said: “Climate change is happening and is already having an impact.
There is more water being wasted in the oceans, and there are more water wars in the ocean.
There are more and more extreme weather events.
We are in an era of more and stronger droughts, floods, storms, and fires.
The longer we wait for water to be available in good quality and quantity, the more we are going to see a significant deterioration in water supplies, and in the future it will have serious impacts on the water supplies of many countries and on the economies of many of them.”
Climate change has also caused some water shortages, and some are not just short-term.
McGovern said that drought in the United Kingdom has left many households in their basements without water.
The drought has led to an increase