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Sådan vil jorden se ud om 80 år - i bedste og værste fald

Business Insider-logo Af Dave Mosher, Aylin Woodward af Business Insider | Slide 1 af 41: 
  Last year was the 
    warmest year on record for the planet's oceans, and the
    fourth-warmest year ever in terms of surface temperature.
  
  That warming trend has continued into 2019: July was the
  hottest month ever in Earth's history. 
  
  Scientists are also discovering that 
    melting in Greenland and Antarctica is occurring much
    faster than they previously thought.
  
  These changes could spell 
    disaster for coastal economies in the form of sea-level
    rise and more frequent (and intense) natural disasters 
    like hurricanes and 
    wildfires.
  
  If greenhouse-gas emissions aren't curbed significantly
  worldwide - and soon - Earth might be 
    almost unrecognizable by the year 2100.
  
  
    Visit
    Business Insider's homepage for more stories.
  

  As humanity nears the end of the 2010s, signs that our planet is
  irrevocably changing can be found everywhere. In the last year
  alone, 
  ocean temperatures broke records, Antarctic melting 
  reached unprecedented rates, and 
  extreme weather swept through the US, Europe, and the Arctic.
  

  Accelerated planet-wide warming has been linked to more species
  extinctions, an increased number of annual heat-waves, and more
  frequent natural disasters like wildfires and hurricanes. 

  According to the most recent
  report from the United Nations' International Panel on Climate
  Change (IPCC), global temperatures will likely rise to 1.5
  degrees Celsius above pre-industrial levels between 2030 and 2052
  if warming continues at the current rate. Staying under that
  threshold was the optimistic goal set in the 
  Paris climate agreement.

  If we hope to limit some of these climate change-related
  consequences, nations and industries must make 
  drastic cuts - and soon - to greenhouse-gas emissions from
  energy production, transportation, industrial work, 
  farming, and other sectors. An increasing
  number of people are 
  demanding such action: In September, 4 million across 161
  countries participated in a 
  worldwide climate strike led by Swedish youth activist Greta
  Thunberg.

  But if emissions continue to increase and Earth's temperature
  increases by more than 3 degrees Celsius, 
  according to the IPCC , oceans would be an average of 3 feet
  higher by the year 2100. Those rising seas would displace 680
  million people in low-lying coastal zones, along with 65 million
  citizens of small island states.

  
    Read More:
    
  Sea levels are projected to rise 3 feet within 80 years,
  according to a new UN report. Hundreds of millions of people
  could be displaced.
  

  Even if carbon emissions dropped to zero tomorrow, scientists say
  we'll still be watching human-driven climate change play out for
  centuries.

  "There's no stopping global warming," Gavin Schmidt, a climate
  scientist and the director of NASA's Goddard Institute of Space
  Studies, 
  previously told Business Insider. "Everything that's happened
  so far is baked into the system."

  Now it's a matter of trying to "save what we can save," according
  to Thunberg. 

  Here's what the Earth could look like by 2100 in our best- and
  worst-case scenarios.

Hvor er vi på vej hen?

Som menneskeheden nærmede sig slutningen af ​​2010'erne, kunne der ses tegn på, at vores planet ændrer sig uigenkaldeligt overalt. Alene i det sidste år slog havtemperaturerne rekord, smeltning af Antarktis nåede et hidtil uset omfang, og ekstremt vejr fejede gennem USA, Europa og Arktis

Accelereret planetær opvarmning er blevet knyttet til flere artsudryddelser, et øget antal årlige hedebølger og hyppigere naturkatastrofer som skovbrande og orkaner. I henhold til den seneste rapport fra FN's internationale klimapanel (IPCC) vil de globale temperaturer mellem 2030 og 2053 sandsynligvis stige 1,5 grader over det præindustrielle niveau, hvis den globale opvarmning fortsætter med den nuværende hastighed. At holde sig under denne tærskel var det optimistiske mål, der blev sat med Paris-aftalen.

Hvis vi håber at kunne begrænse nogle af disse klimaforandringsrelaterede konsekvenser, skal nationer og industrier foretage drastiske - og snarlige - reduktioner i CO2-udledningen fra energiproduktion, transport, industriarbejde, landbrug og andre sektorer. Hvis udledningerne fortsætter med at stige, og Jordens temperatur stiger med mere end 3 grader celsius, ville oceanerne ifølge FN's klimapanel gennemsnitligt være 90 cm. højere i år 2100. De stigende have ville fortrænge 680 millioner mennesker i lavtliggende kystzoner, samt 65 millioner indbyggere i små østater.

Selv hvis CO2-udledningerne faldt til nul i morgen, mener forskere, at vi fortsat ville menneskeskabte klimaforandringerne udspille sig ud i århundreder.

"Der er ingen mulighed for at stoppe den globale opvarmning," sagde Gavin Schmidt, en klimaforsker og direktøren for NASAs Goddard Institute of Space Studies, tidligere til Business Insider. "Alt, hvad der er indtil videre er sket, har sat sit uoprettelige præg på systemet."

Klik gennem dette galleri og at se, hvordan Jorden i bedste fald vil kunne se ud i 2100 - og værste tilfælde.

© David Burdick/NOAA/AP

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