Hi Mohamed, 

I have to say I agree with you, inventory guidebooks are not comprehensive enough in a lot of topics. For example, regarding emissions from transports, you will find guidebooks for different kinds of vehicles, for different world regions, but there will always be missing that one specific info that you need.

Now, you know when doing research you need sources to complement and give value to your work, and those guidebooks are there for that. The information you need might not be there specified but you'll find some which might be close enough.

Besides those guidebooks contain information derived from other studies, which means a lot of work behind them and each new edition gets some sort of revision.

So if you ask me to completely trust those guides, I'll say yes. But keep in mind you need to study each guide well to comprehend how the information got there and how it serves you.

A little bit philosophic but I hope it gets your trust up.

Best regards,

Filipe Rodrigues

You have a point, but you also need to put things into context. In the case you mentioned, GHG emissions from enteric fermentation are typically one order of magnitude larger than those arising from manure losses in barns. When compilers build national inventories, their first task is to be able to capture the bulk of the emissions in a given sector --what we usually refer to as key categories.

You may be interested in downloading our GHG report and GHG manual here:

http://www.fao.org/climatechange/micca/ghg/en/

Dear,

If the case is in transport emissions may help the program: ARTEMIS available on the web.

European Environment Agency, EEA. ARTEMIS-Assessment and Reliability of Transport Emission Models and Inventory Systems. Denmark, 2010.

Regards,

Vanessa