Final answer:
A declarative sentence is a statement or opinion written in the present tense. For example, 'Climate change is a global issue that requires immediate action.'
Step-by-step explanation:
A declarative sentence is a type of sentence that makes a statement or expresses an opinion. It is written in the present tense and presents a fact or an argument. It does not ask a question or give a command.
For example, a declarative sentence related to the problem could be: 'Climate change is a global issue that requires immediate action.'