Ahead of World Toilet Day, the facts and figures of toilets (or improved sanitation) speak for themselves.

On 19 November we celebrate World Toilet Day. While we might take toilets for granted, billions in the world don’t. Toilets and all that is related—loosely called sanitation—play a hugely important role for all of us: not only in our daily lives as we spend time to relieve ourselves, but also for our sustainable, inclusive development. Toilets are crucial for the healthy development of people, not to mention children.

So is sanitation – facilities and services for safe disposal of human urine and faeces includes maintaining hygiene through services such as garbage collection and wastewater disposal. The overall purpose of good sanitation is to provide a healthy living environment for everyone, protect the natural resources such as surface water, groundwater, and soil, and provide safety, security and dignity for people when they defecate or urinate.

The facts and figures of toilets (or improved sanitation) from the World Sanitation Program, the World Health Organization (WHO) and WaterAid, among others, speak for themselves.

1. Today, 2.4 billion people or about one-third of the world’s population lack access to improved sanitation—facilities that hygienically separates human excreta from human contact—and 1 billion people still practice open defecation.

2. In 2012 the WHO estimated that the global economic return on sanitation spending is $5.5 for every dollar invested – nearly triple the $2 economic return on water spending.

3. Open defecation (the practice whereby people go out in fields, bushes and forests, open bodies of water, or other open spaces rather than using the toilet to defecate) is a leading cause of diarrheal death, says the WHO. The diarrhoea death toll stands at around 6,000 a day, mostly young children.

4. In South Asia alone, 1 billion people lack access to improved sanitation and 675 million practice open defecation, more than any other region in the world.

5. Half of global malnutrition cases are linked to chronic diarrhoea caused by lack of clean water, decent sanitation, and good hygiene, including hand washing with soap. The extent of the global stunting crisis and scarce access to clean water and decent toilets is having an enormous impact on the future of millions of children suffering from malnutrition.

6. Without improved sanitation facilities and awareness, the risks of infections or other illnesses from faecal sludge or wastewater are extremely high. Just 1 gram of faeces can contain 10 million viruses, 1 million bacteria, 1,000 parasite cysts, and 100 parasite eggs.

7. Hand-washing with soap after using the toilet is one of the most effective and inexpensive ways to prevent diarrheal diseases and pneumonia. This simple act can reduce the risk of diarrheal disease by up to 47%, but only if it’s done consistently. Research shows that globally less than one-fifth of people currently wash their hands properly at critical times, and only 19% of people wash their hands after using the toilet or changing a child’s diaper. Diarrhoea and pneumonia, two major illnesses that are transmitted this way, together kill an estimated 1.7 million children every year.

8. According to Target 2 of the Sustainable Development Goal no. 6 on sanitation, by 2030 we should achieve access to adequate and equitable sanitation and hygiene for all and end open defecation, paying special attention to the needs of women and girls and those in vulnerable situations. This makes sanitation a global development priority.

9. In India alone about 550 million people defecate in the open, which accounts for more than half of the people in the world who practice open defecation. Indians excrete close to 65,000 metric tons of faeces into the environment each day. This results in 188,000 annual deaths of children under five from diarrhoea. India loses 6.4% of GDP—$53.8 billion—due to poor sanitation on a yearly basis.

On World Toilet Day, we must raise awareness and inspire action to tackle the global sanitation crisis, a topic that is often neglected and shrouded in taboos. Today, 2.4 billion people are struggling to stay healthy, keep their children alive and work their way to a better future – all for the want of a toilet. Let’s change that.