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Related Concept Videos

Conditions on Early Earth02:06

Conditions on Early Earth

Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Conditions on Early Earth02:06

Conditions on Early Earth

Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Transition Zone01:28

Transition Zone

The transition zone in concrete is a critical area where aggregate meets cement paste, marked by a distinct porosity and weakness compared to the surrounding material. The adhesion around the aggregates is primarily due to Van Der Waals forces. The voids within this zone influence its robustness; initially, it is less durable than the surrounding bulk mortar due to larger voids. Initially, when concrete is compacted, a higher water-cement ratio near the aggregates leads to the formation of...
Planes in Space01:31

Planes in Space

A plane in three-dimensional space is fundamentally characterized by a point that lies on the plane and a normal vector that is perpendicular to its surface. This normal vector uniquely determines the orientation of the plane, making it an essential geometric descriptor. In architectural applications, such as the installation of a sloped glass panel on a building façade, this mathematical model provides a precise representation of the panel’s position and orientation in space.Let r₀ be the...
Kepler's First Law of Planetary Motion01:10

Kepler's First Law of Planetary Motion

In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
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Unrenewable Cells00:50

Unrenewable Cells

In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
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Related Experiment Video

Updated: Jul 3, 2026

Simulation of the Planetary Interior Differentiation Processes in the Laboratory
06:04

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Published on: November 15, 2013

Planetary Boundary for Novel Entities: Time for a Reboot.

Annika Jahnke1,2, Yuge Bai3, Werner Brack1,4

  • 1Helmholtz-Centre for Environmental Research - UFZ, Permoserstr. 15, 04318 Leipzig, Germany.

Environmental Science & Technology
|July 2, 2026
PubMed
Summary
This summary is machine-generated.

The current Planetary Boundary for novel entities is too strict, setting a safe limit at zero. A revised approach is needed, balancing precaution with operational reality for sustainable use of novel entities.

Keywords:
Earth system stabilityabsolute environmental sustainability assessmentchemicals and materialsenvironmental governanceglobal (environmental) monitoringpressures − states − impacts control variablesquantitative indicatorsrisk managementsafe operating space

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Area of Science:

  • Earth System Science
  • Environmental Science
  • Chemical Safety

Background:

  • Defining Planetary Boundaries for novel entities is complex due to their diversity.
  • The current boundary's zero-limit approach is impractical and hinders societal benefits derived from novel entities.
  • Existing quantitative boundary lacks operational feasibility and conflicts with risk-based thresholds of other planetary boundaries.

Purpose of the Study:

  • To critique the limitations of the current quantitative Planetary Boundary for Novel Entities.
  • To propose a revised framework for the Planetary Boundary for Novel Entities.
  • To recommend improved governance and monitoring strategies for novel entities.

Main Methods:

  • Analysis of the shortcomings of the current zero-limit precautionary approach.
  • Conceptualization of a risk-based, operational framework for novel entities.
  • Identification of complementary control variables and monitoring system extensions.
  • Review of successful regulatory and policy examples.

Main Results:

  • The zero-limit for novel entities is unattainable, undesirable, and operationally infeasible.
  • A distinction between pure and operational precaution is necessary for defining a safe operating space.
  • Multilayer control variables (pressures, states, impacts) and enhanced monitoring are crucial.
  • Existing governance successes offer models for operational management.

Conclusions:

  • A reboot of the Planetary Boundary for Novel Entities is essential.
  • Operational precaution, multilayered controls, and enhanced monitoring are recommended.
  • Effective governance requires a pragmatic balance between safety and societal needs.