1. China . China is the largest emitter of carbon dioxide gas in the world, with 11,336 million metric tons emitted in 2021. The primary source of CO 2 emissions in China is fossil fuels, most (1) Shielding gas: Shielding gas is used in gas shielded welding to provide protection to the weld pool from the surrounding atmosphere. Commonly used shielding gases include carbon dioxide (CO 2), argon (Ar), helium (He), oxygen (O 2), nitrogen (N 2), hydrogen (H 2), and their mixtures (such as Ar + He, Ar + CO 2, Ar + CO 2 + O 2, etc.).. The International Institute of Welding classifies There are two broad classes of fuel gases, based not on their chemical composition, but their source and the way they are produced: those found naturally, and those manufactured from other materials. Manufactured fuel gas Manufactured fuel gases are those produced by chemical transformations of solids, liquids, or other gases. Acid rain describes any form of precipitation that contains high levels of nitric and sulfuric acids. It can also occur in the form of snow, fog, and tiny bits of dry material that settle to Earth During combustion, the nitrogen bound in the fuel is released as a free radical and ultimately forms free N 2, or NO. Fuel NO x can contribute as much as 50% of total emissions through the combusting oil and as much as 80% through the combusting of coal. Although the complete mechanism is not fully understood, there are two primary pathways of Example: fossil fuels, biogas, nuclear energy, etc. Table of Content Types of Fuel Solid Fuel Liquid Fuel Gaseous Fuel Such materials can further be classified into: Renewable source of energy: one which is inexhaustible. Example: Solar energy. Non-renewable source of energy: one which is exhaustible. Example: Fossil Fuels. .

name two fuel gases