Clothing production has roughly doubled since 2000.

textile factory women working india
Employees sew clothes at the Estee garment factory in Tirupur, in the southern Indian state of Tamil Nadu, June 19, 2013.
REUTERS/Mansi Thapliyal

Source: McKinsey & Company

While people bought 60% more garments in 2014 than in 2000, they only kept the clothes for half as long.

clothes shopping Eid Al-Adha
An Iraqi man looks in the mirror as he shops for clothes in preparation for Eid Al-Adha celebration in Baghdad, Iraq August 9, 2019.
REUTERS/Khalid al-Mousily

Source: McKinsey & Company, Ellen MacArthur Foundation

In Europe, fashion companies went from an average offering of two collections per year in 2000 to five in 2011.

Models Gigi Hadid, from front second left, Bella Hadid and Kaia Gerber wear creations with other models as part of the Max Mara Spring-Summer 2020 collection, unveiled during the fashion week, in Milan, Italy, Thursday, Sept. 19, 2019. (AP Photo/Luca Bruno)
Models Gigi Hadid, from front second left, Bella Hadid and Kaia Gerber wear creations with other models as part of the Max Mara spring-summer 2020 collection in Milan, Italy, September 19, 2019.
AP Photo/Luca Bruno

Source: European Parliament

Some brands offer even more. Zara puts out 24 collections per year, while H&M offers between 12 and 16.

Zara factory
Rows of jackets at Zara's headquarters in Arteixo, Spain, October 2018.
Business Insider/Mary Hanbury

Source: European Parliament

A lot of this clothing ends up in the dump. The equivalent of one garbage truck full of clothes is burned or dumped in a landfill every second.

trash garbage landfill
A truck unloads garbage at a temporary dump on the edge of Beirut, Lebanon September 23, 2015.
REUTERS/Mohamed Azakir

Source: United Nations Environment Programme (UNEP)

In total, up to 85% of textiles go into landfills each year. That's enough to fill the Sydney harbor annually.

Sydney Harbour opera house australia
The Sydney Harbour lit by the setting sun, on a summer day in Australia, November 24, 2018.
REUTERS/David Gray

Source: United Nations Economic Commission for Europe (UNECE), World Resources Institute (WRI)

Washing clothes, meanwhile, releases 500,000 tons of microfibers into the ocean each year — the equivalent of 50 billion plastic bottles.

Laundry mat
A man waits for his washing in a launderette during filming for the Adidas "I Kiss Football" TV commercial in Potters Bar, England, June 12, 2001.
Jamie McDonald/Getty

Source: UNEP, Ellen MacArthur Foundation

Many of those fibers are polyester, a plastic found in an estimated 60% of garments. Producing polyester releases two to three times more carbon emissions than cotton, and polyester does not break down in the ocean.

polyester yarn
An employee works on the production of polyester yarns at the company "SvetlogorskKhimvolokno" in Svetlogorsk, Belarus, May 25, 2016.
REUTERS/Vasily Fedosenko

Source: Greenpeace, WRI

A 2017 report from the International Union for Conservation of Nature (IUCN) estimated that 35% of all microplastics — very small pieces of plastic that never biodegrade — in the ocean came from the laundering of synthetic textiles like polyester.

plastic pollution ocean waste environment.JPG
A boy in the Philippines collects plastic materials near a polluted coastline.
Cheryl Ravelo/Reuters

Source: IUCN

Overall, microplastics are estimated to compose up to 31% of plastic pollution in the ocean.

Green sea turtle
A giant green turtle rests on a coral reef at a diving site near the island of Sipadan in Celebes Sea, east of Borneo, November 7, 2005.
Reuters

Source: IUCN

The fashion industry is responsible for 10% of humanity's carbon emissions.

Man uses his mobile phone as he walks amid smog in Tianjin after the city issued a yellow alert for air pollution
A man uses his mobile phone as he walks amid smog in Tianjin, China after the city issued a yellow alert for air pollution, November 26, 2018.
Stringer / Reuters

Source: UNEP

That's more emissions than all international flights and maritime shipping combined.

airplane
A Cathay Pacific Airways Airbus A350 airplane approaches to land at Changi International Airport in Singapore, June 10, 2018.
REUTERS/Tim Chong

Source: UNEP

If the fashion sector continues on its current trajectory, that share of the carbon budget could jump to 26% by 2050, according to a 2017 report from the Ellen MacArthur Foundation.

canada goose textile factory
Workers make jackets at the Canada Goose factory in Toronto.
Reuters/Mark Blinch

Source: Ellen MacArthur Foundation

The fashion industry is also the second-largest consumer of water worldwide.

chennai water
Women fetch water from an opening made by residents at a dried-up lake in Chennai, India, where taps ran dry city-wide in June 2019.
REUTERS/P. Ravikumar/File Photo

Source: UNECE

Read more: New Mexico faces extreme water scarcity on par with the United Arab Emirates. Experts warn more 'day zeros' are looming.

It takes about 700 gallons of water to produce one cotton shirt. That's enough water for one person to drink at least eight cups per day for three-and-a-half years.

Drinking Water
A man drinks water near a fountain on a hot summer day in Brussels, Belgium, July 19, 2016.
REUTERS/Francois Lenoir

Source: WRI

It takes about 2,000 gallons of water to produce a pair of jeans. That's more than enough for one person to drink eight cups per day for 10 years.

Costco jeans
Shoshy Ciment/Business Insider

Source: UNEP

That's because both the jeans and the shirt are made from a highly water-intensive plant: cotton.

burkina faso cotton
Farmers work at a cotton market in Soungalodaga village near Bobo-Dioulasso, Burkina Faso March 8, 2017.
REUTERS/Luc Gnago

In Uzbekistan, for example, cotton farming used up so much water from the Aral Sea that it dried up after about 50 years. Once one of the world's four largest lakes, the Aral Sea is now little more than desert and a few small ponds.

Aral Sea
An image of the Aral Sea as captured by NASA's Earth Observatory on August 25, 2000 (left) shows the diminished shoreline from where the lake sat in 1960. In 2014 (right), the lake's east lobe dried up for the first time in 600 years.
NASA

Source: Business Insider

Fashion causes water-pollution problems, too. Textile dyeing is the world's second-largest polluter of water, since the water leftover from the dyeing process is often dumped into ditches, streams, or rivers.

dye yarn textile mill
A worker dyes yarn at a textile mill on the outskirts of Agartala, the capital of India's northeastern state of Tripura, April 19, 2008.
REUTERS/Jayanta Dey

Source: UNEP, The New York Times, The Guardian 

The dyeing process uses enough water to fill 2 million Olympic-sized swimming pools each year.

water pollution bangladesh tannery
The water in a ditch turns red as chemicals and waste are dumped into it from nearby tannery factories in Dhaka, Bangladesh, May 14, 2005.
REUTERS/Rafiquar Rahman

Source: WRI

All in all, the fashion industry is responsible for 20% of all industrial water pollution worldwide.

bangladesh river pollution
A boy swims in the polluted waters of the Buriganga river in Dhaka, Bangladesh, May 14, 2009.
REUTERS/Andrew Biraj (Bangladesh Environment Society)

Source: WRI, UNEP