Critically evaluate the role of human beings in perpetuating climate change

Explanation:

To many people around the world, earth is considered to be a place for human beings to live together as one big family. It provides us shelters, foods, water, and the most beautiful sceneries. Without doubt, we are bound to nature. However because the existence of climate change, which according to scientists is defined as the long term changes over climate including temperature and rainfall, the world would probably end up with devastated ecosystem, extinct wildlife, and most importantly despondent humans. The impact that it has on us is incredibly strong that it affects the system of human lives and wildlife. Global warming, precipitating weather, glaciers, and rising of sea level are no more phenom

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.