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Related Concept Videos

Introduction to Limits01:30

Introduction to Limits

A limit describes the value a function approaches as its input moves closer to a particular point. Even when a function is undefined at a specific value, limits allow us to analyze its behavior near that point. This concept is fundamental in calculus and essential for understanding continuity, derivatives, and integrals.Mathematically, a function f(x) has a limit L at x = a if its values L approach x as x gets arbitrarily close to a. This is written as:This notation expresses that the function...
Limit Laws I01:25

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Limit laws provide essential tools for analyzing how functions behave as their input approaches a specific value. These laws are particularly useful when dealing with combinations of functions, provided the individual limits exist. The Sum and Difference Laws state that the limit of the sum or difference of two functions equals the sum or difference of their respective limits:The Product Law asserts that the limit of the product of two functions equals the product of their individual limits:A...
Limits of the First Law of Thermodynamics01:22

Limits of the First Law of Thermodynamics

Spontaneous processes, like a rock falling to the ground or sodium reacting with chlorine, occur without external work and often involve a decrease in the system‘s energy. However, certain endothermic processes, such as the dissolution of sodium chloride in water, occur spontaneously even though they increase the energy of the system. This limitation suggests that the First Law of Thermodynamics, which states that the total energy of a system is constant in an isolated system, cannot fully...
The Calvin Benson Cycle01:46

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Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
Limiting Reactant02:27

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Microbes and Climate Change01:27

Microbes and Climate Change

Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...

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Related Experiment Video

Updated: May 23, 2026

Implementation of Portable Emissions Measurement Systems (PEMS) for the Real-driving Emissions (RDE) Regulation in Europe
09:34

Implementation of Portable Emissions Measurement Systems (PEMS) for the Real-driving Emissions (RDE) Regulation in Europe

Published on: December 4, 2016

Technology limits for reducing EU transport sector CO2 emissions.

Lynnette M Dray1, Andreas Schäfer, Moshe E Ben-Akiva

  • 1University of Cambridge, Institute for Aviation and the Environment, 1-5 Scroope Terrace, Cambridge CB2 1PX, UK. lmd21@cam.ac.uk

Environmental Science & Technology
|March 23, 2012
PubMed
Summary
This summary is machine-generated.

Lifecycle carbon dioxide (CO2) emissions from transport in the 27 EU countries are projected to rise without new policies. Meeting 2050 climate goals will be challenging due to biofuel limits and technology gaps.

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Last Updated: May 23, 2026

Implementation of Portable Emissions Measurement Systems (PEMS) for the Real-driving Emissions (RDE) Regulation in Europe
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Published on: May 22, 2020

Area of Science:

  • Environmental science
  • Transportation engineering
  • Climate policy

Background:

  • Global transport sector is a major source of greenhouse gas emissions.
  • European Union (EU27) has set ambitious climate targets for 2050.
  • Current transport technologies and demand models may not suffice to meet these targets.

Purpose of the Study:

  • To estimate lifecycle carbon dioxide (CO2) emissions for the EU27 transport sector up to 2050.
  • To assess the impact of policy interventions on future transport emissions.
  • To identify key barriers to achieving emission reduction goals.

Main Methods:

  • Utilized a novel dataset on techno-economic characteristics of transport technologies.
  • Synthesized existing transport demand models.
  • Modeled lifecycle CO2 emissions under various scenarios (no policy, policy interventions).

Main Results:

  • Future CO2 emissions are sensitive to economic growth and geographical scope.
  • Without new policies, EU27 transport emissions are projected to increase.
  • Even with widespread adoption of advanced technologies, emission goals remain difficult to achieve.

Conclusions:

  • Current EU27 emissions goals, requiring a 60% reduction by 2050, are unlikely to be met without significant policy changes.
  • Limitations in biofuel production and lack of CO2 reduction technologies for heavy trucks and aviation are critical barriers.
  • Substantial technological and policy advancements are necessary to decarbonize the transport sector.