“Yeah, it's a huge environmental disaster.”

You're talking with a coworker about a large oil spill. She is talking about how big of a problem it is. You agree, so you say:

Yeah, it's a huge environmental disaster.

Yeah

"Yeah" means "yes" but is better for most conversational situations. It sounds more friendly than "yes".

huge

"Huge" means "very big". Some things that are often described as "huge" are:

• a huge amount of something
• a huge animal
• a huge crowd
• make a huge difference
• (something) was a huge success

environmental disaster

"The environment" means the natural world - the air, oceans, plants and animals, etc. A "disaster" is an event that hurts a lot of people or destroys a lot of things. So an "environmental disaster" is a big event that causes a lot of pollution, hurts a lot of plants and animals, etc.

Some evironmental disasters are:

• oil spills
• nuclear power leaks
• chemical spills