Sea-Level Rise: Thermal Expansion vs Melting Ice – An Evergreen Explainer
Sea-level rise is driven by two main processes: thermal expansion of seawater as it warms, and the addition of freshwater from melting land ice.…
Topic archive
Planetary Boundaries
Core framework outlining safe operating limits for Earth’s systems.
Ocean Alkalinity Enhancement: Potential and Risks
Quick verdict: Ocean alkalinity enhancement is a promising but unproven carbon removal method that could also mitigate ocean acidification. It faces significant uncertainties regarding…
Why Freshwater Change Is More Than Water Consumption
Freshwater change encompasses shifts in water availability, quality, timing, and distribution driven by climate change, land use, pollution, and other factors beyond direct human…
What Is Desertification? Definition, Causes, and Solutions
Desertification is the persistent degradation of dryland ecosystems by human activities and climatic variations, leading to the loss of biological productivity and the expansion…
How Carbon Dioxide Changes Ocean Chemistry
When carbon dioxide (CO₂) from the atmosphere dissolves in seawater, it triggers a series of chemical reactions that lower the ocean's pH, a process…
Gross Zero vs Net Zero Emissions: Understanding the Difference
Gross zero emissions means eliminating all greenhouse gas emissions at their source, while net zero allows for some residual emissions to be balanced by…
Avoidance Credits vs Removal Credits: A Comparative Analysis of Carbon Market Instruments
Avoidance credits finance projects that prevent emissions, while removal credits support projects that extract CO2 from the atmosphere. Both are used in carbon markets…
What Counts as a Novel Entity?
A novel entity is a new substance, a new form of an existing substance, or a modified life form introduced by human activities that…
Planetary Boundaries vs Environmental Thresholds
The planetary boundaries framework defines a safe operating space for humanity by identifying nine Earth-system processes and their thresholds. Unlike traditional environmental thresholds that…
Planetary Boundaries and Intergenerational Justice
The planetary boundaries framework defines a safe operating space for humanity, which is intrinsically linked to intergenerational justice—the obligation to leave future generations a…