1. Explore – Foundations of Ecosystems and Climate Impact

1.1 What are Ecosystems?

An ecosystem is a community of living organisms (plants, animals, and microbes) interacting with their nonliving environment (e.g. air, water, soil, sunlight). Ecosystems can be as large as a forest or as small as a pond.

• Types of Ecosystems:
  
  • Terrestrial: Forests, grasslands, deserts, tundras, mountains.
  • Aquatic: Freshwater (rivers, lakes, ponds, wetlands) and Marine (oceans, coral reefs, estuaries).
• Ecosystem Services: Healthy ecosystems provide essential benefits to humans, often called "ecosystem services":
  
  • Provisioning: Food, water, timber, fiber.
  • Regulating: Climate regulation, flood control, disease regulation, water purification, air quality regulation.
  • Cultural: Recreation, aesthetic beauty, spiritual enrichment.
  • Supporting: Nutrient cycling, soil formation, primary production.

1.2 What is Climate Change?

Climate change refers to long-term shifts in temperatures and weather patterns. These shifts may be natural, but since the 1800s, human activities have been the main driver of climate change, primarily due to the burning of fossil fuels (like coal, oil, and gas), which produces heat-trapping gases (Regoto et al., 2022).

• Greenhouse Effect: Certain gases in the Earth's atmosphere trap heat, much like the glass walls of a greenhouse. This natural process keeps our planet warm enough to support life. However, human activities are increasing the concentration of these gases (e.g. carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O)), intensifying the greenhouse effect and leading to global warming (https://science.nasa.gov/climate-change/faq/what-is-the-greenhouse-effect/)

The key impacts of greenhouse effect are rising global temperatures, more frequent and intense heat waves, melting glaciers and ice sheets, rising sea levels, changes in precipitation patterns (leading to more severe droughts or floods), and increased frequency of extreme weather events.

1.3 What is Ecosystem Restoration?

Ecosystem restoration is the process of assisting the recovery of an ecosystem that has been degraded, damaged, or destroyed. The goal is to return the ecosystem to a healthy, resilient, and self-sustaining state, often resembling its historical condition or at least a functional state that provides essential services.

• Common Restoration Methods:
  
  • Reforestation/Afforestation: Planting trees on deforested land (reforestation) or on land where there was no forest previously (afforestation).
  • Wetland Restoration: Bringing back the natural hydrology and vegetation of drained or degraded wetlands.
  • Coastal Restoration: Protecting and rebuilding coastal habitats like mangroves, salt marshes, and coral reefs.
  • Soil Regeneration: Practices that rebuild healthy soil, such as no-till farming, cover cropping, and composting.
  • River Restoration: Restoring natural river flows and habitats, often by removing dams or re-meandering straightened sections.

➢    Ecosystem restoration projects are occurring around the world: https://obaines.github.io/frontiers_restoration/restoration_map.html

1.4 How Does Ecosystem Restoration Combat Climate Impact?

Ecosystem restoration is a powerful nature-based solution to climate change.

• Carbon Sequestration: Healthy ecosystems, particularly forests, wetlands, and oceans, act as "carbon sinks" by absorbing large amounts of carbon dioxide from the atmosphere and storing it in biomass (trees, plants) and soil.
  
  • Example: A growing forest continuously pulls CO2 from the air through photosynthesis. Peatlands and mangrove forests are particularly effective carbon sinks, storing vast amounts of carbon in their soils.
• Building Resilience: Restored ecosystems are more resilient to the impacts of climate change. For example:
  
  • Healthy wetlands and coastal ecosystems can absorb storm surges and reduce flood damage.
  • Diverse forests are more resistant to pests and diseases, which can be exacerbated by changing climates.
• Biodiversity Protection: Climate change poses a significant threat to biodiversity. Restoration efforts often focus on restoring habitats, which in turn supports a wider variety of plant and animal species, making ecosystems healthier and more stable.
• Water Regulation: Restored forests and wetlands improve water infiltration, reduce soil erosion, and regulate water cycles, which can mitigate the impacts of droughts and floods.