Hi does anyone know how to calculate the UN's de facto temperature target using max co2 relative to 2008 that can be in the atmpsphere to the nearest Gtc? please

Hi

Had a look at the sites, couldn't find any help. Do you know about IPCC?

Cheers
Brad

http://www.google.com/search?hl=en&client=firefox-a&hs=vB0&rlz=1R1GGLL_en___US379&q=ipcc&aq=f&aqi=g10&aql=&oq=&gs_rfai=

Calculating the United Nations' de facto temperature target requires understanding a few concepts: CO2 emissions, atmospheric concentration, and GtC (Gigatonnes of Carbon). The process involves collecting data and performing calculations to determine the target. Here's how you can go about it:

1. Determine the CO2 emissions in the reference year (2008): Find the total global CO2 emissions in 2008. You can refer to reports from reliable sources like the International Energy Agency (IEA), World Bank, or United Nations Framework Convention on Climate Change (UNFCCC).

2. Convert CO2 emissions to GtC: To calculate the amount of carbon dioxide, it is necessary to convert CO2 emissions to GtC. To do this, you need to know the molecular weight of CO2, which is approximately 44 grams per mole. Convert the annual CO2 emissions to metric tonnes (1 Gt = 1 billion metric tonnes) and divide by the molecular weight of CO2.

3. Calculate the maximum CO2 concentration relative to 2008: Determine the maximum allowable CO2 concentration increase since 2008. Subtract the 2008 CO2 concentration from the target concentration. The target concentration may vary depending on the goal, but typically it is defined as the concentration needed to limit global warming to a specific degree (e.g., 1.5°C or 2°C above pre-industrial levels).

4. Convert the CO2 concentration increase to GtC: To convert the concentration increase to GtC, you need to know the volume of the atmosphere. The atmosphere contains approximately 2,500 GtC. Multiply the concentration increase (in parts per million) by the volume of the atmosphere to get the carbon content increase in GtC.

5. Calculate the remaining allowable emissions: Subtract the carbon content increase (in GtC) from the available carbon budget to determine the remaining allowable emissions in GtC. The carbon budget is the total amount of CO2 that can be emitted while still achieving the target temperature increase.

6. Round the result to the nearest GtC: After performing the calculations, round the remaining allowable emissions to the nearest GtC to get the UN's de facto temperature target.

It's important to note that the specific target and values mentioned above are for illustrative purposes only. The actual target and data may vary depending on the specific UN document or agreement being referred to. It's recommended to consult the relevant UN reports or official sources to obtain the precise values for any calculations related to the UN's de facto temperature target.