2021 in the environment and environmental sciences

2021, 2021–2022 Iranian protests, List of elections in 2021, 2021 Booker Prize, 2021 in sports, Miss Brazil 2021, Zapad 2021, 2021 in film, 2021 heat waves, 2021 London Broncos season, Miss Hong Kong 2021, 2021 Q School, 2021 Canadian census, List of 2021 Afghanistan attacks, 2021 Pakistani protests, Microsoft Office 2021, 2021 NBL pre-season, 2021 WNBA playoffs, 2021 in paleomammalogy, 2021 in Palestine, 2021 Kabul airlift, 2021–2023 Stagecoach strikes, 2021 Wisconsin elections, FIBA AfroBasket 2021, 2021 NBL–Pilipinas Chairman's Cup, 2021 Russian census, 2021–22 Scottish Cup, 2021–22 AFC Wimbledon season, 2021 Islamic Solidarity Games, 2021–22 Gillingham F.C. season, 2021 in UFC, 2021 SAFF Championship, 2021–2022 United Kingdom censuses, 2021 Polish speedway season, 2021 European Baseball Championship, 2021 Pakistan Super League, 2021–2025 Bulgarian political crisis, 2021 Super League season, 2021 in Professional Fighters League, 2021 Alberta referendum, 2021 Empress's Cup final

2021 Uttarakhand flood, 2021–22 Reading F.C. season, Wildfires in 2021, 2021 Australian census, Timeline of the Israeli–Palestinian conflict in 2021, 2021 Russia–United States summit, September 2021 Sudanese coup attempt, 2021 in science, 2021 BC Lions season, 2021 Indian Premier League, 2021 Pacific hurricane season, 2021 Tennessee Volunteers football team, 2021 SEA Games, 2021 SEC softball tournament, 2021 Hormozgan earthquakes, International cricket in 2021–22, 2021 G20 Rome summit, Tornadoes of 2021, 2021 Andhra Pradesh panchayat elections, 2021–22 Scottish Women's Premiership season, Produce Camp 2021, 2020–2021 Vendée Globe, 2021–22 Liga 2 (Indonesia), Planet Prince 2021, 2021–22 Stevenage F.C. season, 2021 Africa Cup of Nations, 2021–22 Doncaster Rovers F.C. season, 2021 Austin W Series round, 2021 Zavarovalnica Sava Portorož, 2021 (song), 2021 Nagoya mayoral election, 2021–22 Valparaiso Beacons men's basketball team, 2021–22 Ashes series, 2021–22 Championnat Pro A, PFL 10 (2021), Mukhosh (2021 film), 2021 in England, 2021 Armenian political crisis, 2021 Città di Forlì II, 2021 CFL Premier Division, 2021 Indian farmers' Republic Day protest, Vision 2021, 2021–22 Al Hilal SFC season, 2021–22 Zamalek SC (handball), 2021–22 Walsall F.C. season, 2021 New York state elections, International cricket in 2021, 2021 in Eswatini, 2021–22 Barnsley F.C. season, 2021 cabinet reshuffle

2021, 2021–2022 Iranian protests, List of elections in 2021, 2021 Booker Prize, 2021 in sports, Miss Brazil 2021, Zapad 2021, 2021 in film, 2021 heat waves, 2021 London Broncos season, Miss Hong Kong 2021, 2021 Q School, 2021 Canadian census, List of 2021 Afghanistan attacks, 2021 Pakistani protests, Microsoft Office 2021, 2021 NBL pre-season, 2021 WNBA playoffs, 2021 in paleomammalogy, 2021 in Palestine, 2021 Kabul airlift, 2021–2023 Stagecoach strikes, 2021 Wisconsin elections, FIBA AfroBasket 2021, 2021 NBL–Pilipinas Chairman's Cup, 2021 Russian census, 2021–22 Scottish Cup, 2021–22 AFC Wimbledon season, 2021 Islamic Solidarity Games, 2021–22 Gillingham F.C. season, 2021 in UFC, 2021 SAFF Championship, 2021–2022 United Kingdom censuses, 2021 Polish speedway season, 2021 European Baseball Championship, 2021 Pakistan Super League, 2021–2025 Bulgarian political crisis, 2021 Super League season, 2021 in Professional Fighters League, 2021 Alberta referendum, 2021 Empress's Cup final, 2021 Uttarakhand flood, 2021–22 Reading F.C. season, Wildfires in 2021, 2021 Australian census, Timeline of the Israeli–Palestinian conflict in 2021, 2021 Russia–United States summit, September 2021 Sudanese coup attempt, 2021 in science, 2021 BC Lions season, 2021 Indian Premier League, 2021 Pacific hurricane season, 2021 Tennessee Volunteers football team, 2021 SEA Games, 2021 SEC softball tournament, 2021 Hormozgan earthquakes, International cricket in 2021–22, 2021 G20 Rome summit, Tornadoes of 2021, 2021 Andhra Pradesh panchayat elections, 2021–22 Scottish Women's Premiership season, Produce Camp 2021, 2020–2021 Vendée Globe, 2021–22 Liga 2 (Indonesia), Planet Prince 2021, 2021–22 Stevenage F.C. season, 2021 Africa Cup of Nations, 2021–22 Doncaster Rovers F.C. season, 2021 Austin W Series round, 2021 Zavarovalnica Sava Portorož, 2021 (song), 2021 Nagoya mayoral election, 2021–22 Valparaiso Beacons men's basketball team, 2021–22 Ashes series, 2021–22 Championnat Pro A, PFL 10 (2021), Mukhosh (2021 film), 2021 in England, 2021 Armenian political crisis, 2021 Città di Forlì II, 2021 CFL Premier Division, 2021 Indian farmers' Republic Day protest, Vision 2021, 2021–22 Al Hilal SFC season, 2021–22 Zamalek SC (handball), 2021–22 Walsall F.C. season, 2021 New York state elections, International cricket in 2021, 2021 in Eswatini, 2021–22 Barnsley F.C. season, 2021 cabinet reshuffle, 2021–22 Middlesbrough F.C. season, 2021 in the British Virgin Islands, PFL 7 (2021), 2021–22 Southampton F.C. season, January 2021 Baghdad bombings, 2021 Paradise Jam, 2021–22 Portsmouth F.C. season, 2021 Dallas municipal election, 2021 Lahore bombing, 2021–22 CCHA season, List of The Late Show with Stephen Colbert episodes (2021), 2021 Gent–Wevelgem, E3 2021, 2021 Norwegian Football Cup, 2021 Porto Open, PFL 8 (2021), 2021 United States gubernatorial elections, 2021–22 NCHC season, 2021 Four Nations Football Tournament, 2021 Sukma–Bijapur attack, 2021 in Qatar, 2021 W Series, King of the Ring (2021), 2021 in Peru, 2021 in France, 2021–22 Brentford F.C. season, 2021 NFL season, 2021 Classic Brugge–De Panne, 2021 Super 20 Trophy, 2021 South African unrest, 2021 Bratislava Open, List of spaceflight launches in January–June 2021, 2021 Extreme E Championship, 2021 BAL finals, 2021 Wimbledon Championships, Associate international cricket in 2021–22, Miss Vibhaa 2021, 2021 MotoE World Cup, 2021–22 Premier League, 2021 in Vietnam, 2021–22 Tranmere Rovers F.C. season, 2021–22 Newport County A.F.C. season, List of spaceflight launches in July–December 2021, 2021 WNBA Finals, 2021 Edmonton Elks season, War Chamber (2021), 2021–22 New Jersey Devils season, 2021 Italy wildfires, Candidates Tournament 2020–2021, 2021 in Russia, 2021 2nd Spielberg W Series round, 2021–22 Håndboldligaen, 2021 in Canada, 2021 in spaceflight, PFL 9 (2021), Battle of Kandahar (2021), 2021 Detroit Sports Car Classic, 2021 in the Gambia, Weather of 2021, Timeline of the Myanmar civil war (2021–present)