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Related Concept Videos

Sustainable Development01:43

Sustainable Development

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As the human population continues to grow and use resources, we must be mindful of our planet’s natural limits. Sustainable development provides a pathway to maintain and improve human life now while also ensuring that future generations will have the resources that they need. The long-term success of sustainability efforts rests on understanding the interplay between human actions and ecological systems.
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Changes in the environment of the early Earth drove the evolution of organisms. As prokaryotic organisms in the oceans began to photosynthesize, they produced oxygen. Eventually, oxygen saturated the oceans and entered the air, resulting in an increase in atmospheric oxygen concentration, known as the oxygen revolution approximately 2.3 billion years ago. Therefore, organisms that could use oxygen for cellular respiration had an advantage. More than 1.5 years ago, eukaryotic cells and...
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Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
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The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.
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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Exploring pathways for world development within planetary boundaries.

Detlef P van Vuuren1,2, Jonathan C Doelman3,4, Isabela Schmidt Tagomori3

  • 1Netherlands Environmental Assessment Agency (PBL), The Hague, The Netherlands. detlef.vanvuuren@pbl.nl.

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This summary is machine-generated.

Humanity is exceeding planetary boundaries, risking Earth's stability. Even with policy interventions, climate change, biogeochemical flows, and biodiversity will remain transgressed by 2050, requiring stronger environmental policies.

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Area of Science:

  • Environmental science
  • Earth system science
  • Sustainability science

Background:

  • Human activities are destabilizing Earth's environment.
  • The planetary boundaries framework defines a safe operating space for humanity.
  • Evaluating trends is crucial for identifying sustainable pathways.

Purpose of the Study:

  • To project the state of eight planetary boundaries by 2050 under different policy scenarios.
  • To assess the impact of environmental policies on Earth's stability.
  • To identify pathways for humanity to live within planetary boundaries.

Main Methods:

  • Utilized the Integrated Model to Assess the Global Environment (IMAGE).
  • Projected control variables for eight of nine planetary boundaries.
  • Analyzed scenarios with and without strong environmental policies until 2050.

Main Results:

  • Current trends and policies project worsening conditions for most planetary boundaries by 2050, except ozone depletion.
  • Targeted interventions (e.g., Paris Agreement, dietary shifts, resource efficiency) can reduce boundary transgressions.
  • Inertia means climate change, biogeochemical flows, and biodiversity will likely remain transgressed in 2050 even with interventions.

Conclusions:

  • Significant policy action is needed to ensure humanity operates within planetary boundaries.
  • Current trajectories are unsustainable, highlighting the urgency for enhanced environmental governance.
  • Achieving sustainability requires addressing systemic inertia and implementing more effective, feasible policy measures.