The Trillionth Tonne of Carbon and Why It Matters For Climate Change

TL;DR

The amount of carbon dioxide emissions we dump into the atmosphere determines the future warming of the climate system, and achieving Net Zero emissions is crucial to stabilize temperatures.

Transcript

foreign welcome everybody to the fifth of our Frank Jackson Professor lectures on Net Zero um and I'm very excited about this one now you should be too because it's likely to go horribly wrong um this is where we couple together the model we built in lectures two and three of how the temperature of the climate system responds to changing atmospheri... Read More

Key Insights

• 🇧🇶 The amount of carbon dioxide emissions determines future warming, and achieving Net Zero emissions is necessary to stabilize temperatures.
• 🥺 Different emission scenarios and rates of emissions lead to varying peak concentrations of CO2, but they all result in the same final temperature outcome.
• 💱 Proportional emissions reductions, rather than stabilization concentrations, give us a better understanding of necessary actions to mitigate climate change.
• ⚖️ Understanding the balance between emissions, concentrations, and temperature is essential for effective climate policy and decision-making.
• 🪡 The Trillionth Ton concept highlights the urgent need to reduce carbon emissions and move towards Net Zero to avoid dangerous levels of warming.
• 🖐️ Carbon capture and storage technology plays a significant role in reducing emissions, but it is more expensive than other forms of emission reduction.
• 🤨 Achieving Net Zero also raises important moral and justice questions concerning historical emissions and the responsibility of developed countries.

Questions & Answers

Q: Why is Net Zero emissions important?

Net Zero emissions are crucial for stabilizing temperatures since it means no further warming or cooling at the surface, allowing us to limit the impacts of climate change.

Q: How does the rate of emissions affect future warming?

Faster rates of emissions result in higher peak concentrations of CO2, leading to more rapid temperature increases. Slower rates of emissions result in lower peak concentrations but still lead to the same final temperature outcome.

Q: What happens if we stabilize concentrations of greenhouse gases in the atmosphere?

Stabilizing concentrations allows emissions to continue, causing temperatures to keep rising. This is because the speed of emissions is proportional to the level of CO2 concentrations in the atmosphere.

Q: Why is the relationship between cumulative carbon emissions and warming important?

The relationship between cumulative emissions and warming helps determine the amount of carbon we can safely emit while avoiding dangerous levels of warming. It provides crucial guidance for climate policies and decision-making.

Summary & Key Takeaways

• The Trillionth Ton concept was introduced in 2009, highlighting the connection between cumulative carbon emissions and future warming.

• Stabilizing concentrations of greenhouse gases in the atmosphere allows emissions to continue, resulting in a continuous rise in temperatures.

• Net Zero emissions, where emissions are reduced to zero, leads to no further warming or cooling at the surface.

• Different emission scenarios and rates of emissions result in varying peak concentrations of CO2, but they all lead to the same final temperature outcome.