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The Science of Climate Change

Climate change is no longer a distant threat or just a possibility, it is now a reality for all of us. In this pathway, Kevin Trenberth, a renowned climatologist, delves into the science behind climate change. He first introduces the climate system, its main components and forces.

Tackling the Plastic Crisis

Plastic pollution is by far the biggest threat to our oceans and this remains an incredibly tough problem to solve. Plastic credits could potentially serve as one of the much needed solutions for this crisis.

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The Scale of the Net Zero Challenge

The price of meeting net zero is estimated to be between $100-150 trillion over the next 30 years. Regardless of this cost, we need to reach net zero before climate change does irreversible damage to the environment and the economy.

ESG, Sustainability and Impact Jargon Buster

ESG, sustainability, impact… they all just mean green, right? Not quite. Despite being used often interchangeably, there are distinct differences between these terms.

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The Science of Climate Change

Climate change is no longer a distant threat or just a possibility, it is now a reality for all of us. In this pathway, Kevin Trenberth, a renowned climatologist, delves into the science behind climate change. He first introduces the climate system, its main components and forces.

Tackling the Plastic Crisis

Plastic pollution is by far the biggest threat to our oceans and this remains an incredibly tough problem to solve. Plastic credits could potentially serve as one of the much needed solutions for this crisis.

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+1,000 expert presented, on-demand video modules

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The Scale of the Net Zero Challenge

The price of meeting net zero is estimated to be between $100-150 trillion over the next 30 years. Regardless of this cost, we need to reach net zero before climate change does irreversible damage to the environment and the economy.

ESG, Sustainability and Impact Jargon Buster

ESG, sustainability, impact… they all just mean green, right? Not quite. Despite being used often interchangeably, there are distinct differences between these terms.

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Alternative Approaches to Carbon Dioxide Removal II

Alternative Approaches to Carbon Dioxide Removal II

Sacha Corby

In this video, Sacha delves into the world of engineered carbon dioxide removal (CDR) solutions, exploring how technologies like enhanced rock weathering, bioenergy with carbon capture and storage (BECCS), and direct air capture and storage (DACS) work to remove and store CO2. She also highlights the urgent need to scale multiple CDR methods simultaneously to meet the 6-gigaton removal target by 2050.

In this video, Sacha delves into the world of engineered carbon dioxide removal (CDR) solutions, exploring how technologies like enhanced rock weathering, bioenergy with carbon capture and storage (BECCS), and direct air capture and storage (DACS) work to remove and store CO2. She also highlights the urgent need to scale multiple CDR methods simultaneously to meet the 6-gigaton removal target by 2050.

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Alternative Approaches to Carbon Dioxide Removal II

11 mins 49 secs

Key learning objectives:

  • Understand how Enhanced Rock Weathering, BECCS, and DACS remove and store CO2

  • Recognise the trade-offs between scalability, permanence, and cost across these CDR approaches

  • Understand the need to scale multiple CDR methods to achieve climate goals effectively

Overview:

Engineered CDR solutions include the likes of enhanced rock weathering, bioenergy with carbon capture and storage, and direct air capture. Enhanced rock weathering accelerates natural CO2 absorption by spreading crushed rock on fields, improving soil health and storing carbon in the ocean for millennia. BECCS captures CO2 released from biomass used for energy, pumping it into underground storage with high permanence but limited scalability due to biomass availability. DACS removes CO2 directly from the air using modular, energy-intensive technologies with exceptional durability and measurability. Each approach has unique strengths and challenges. Scaling these solutions is crucial to achieving the 6 gigatons of CDR required by 2050 to limit global warming, demanding immediate investment in diverse CDR strategies.

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Summary
What is enhanced rock weathering, and how does it sequester CO2?

Enhanced rock weathering accelerates natural processes by spreading crushed rock on agricultural fields, increasing its surface area to react with CO2 in rainwater. This reaction forms bicarbonate ions, which are transported to the ocean, where carbon is stored for millennia. The process improves soil health and reduces acidity but faces challenges in measuring CO2 removal and scaling due to laboratory analysis costs.

How does Bio-Energy with Carbon Capture and Storage (BECCS) combine natural and engineered processes for carbon removal?

BECCS uses biomass, which captures CO2 through photosynthesis, as an energy source. During energy generation, CO2 released from the biomass is captured and stored underground in geological formations, achieving long-term sequestration. While BECCS provides high permanence, its scalability is limited by the availability of sustainable biomass and the need to avoid emissions displacement during sourcing.

What makes Direct Air Capture and Storage (DACS) a highly measurable and durable carbon dioxide removal method?

DACS removes CO2 directly from ambient air using collector units powered by renewable energy. Captured CO2 is stored in geological formations, ensuring permanence for tens of thousands of years. DACS allows precise measurement of CO2 captured and stored using flow meters at injection sites. While it offers exceptional durability and measurability, DACS faces challenges from high costs due to engineering and energy requirements.

Why is it necessary to scale all carbon dioxide removal (CDR) approaches simultaneously?

Each CDR method has unique benefits and challenges. By scaling multiple approaches, risks like technological limitations and resource constraints are mitigated, while innovation is accelerated. This diversification ensures that the 6 gigatons of annual carbon removal required by 2050 can be achieved, providing a resilient and comprehensive strategy to limit global warming to 1.5°C.

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Sacha Corby

Sacha Corby

Dr. Sacha Corby, Director of CDR Science & Technology at Climeworks, is dedicated to identifying the best carbon dioxide removal methods. With a PhD in Chemistry from Imperial College London and experience in solar energy conversion, she combines science skills with business insights from three years at Bain & Company in Switzerland. Her team at Climeworks screens carbon removal approaches and suppliers to ensure that a CDR credit accurately represents one ton of CO2 removed.

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