"Green hat" in Engpsh refers to a specific thinking technique used in creative problem-thinking and idea generation, also known as "Six Thinking Hats" method.

The "Six Thinking Hats" method was developed by Edward de Bono in the 1980s. It is a tool for group discussion and individual thinking involving six colored hats. Each color represents a specific type of thinking:

White Hat: neutral and objective thinking, gathering information
Red Hat: emotional and intuitive thinking
Black Hat: critical and negative thinking, identifying problems
Yellow Hat: positive and logical thinking, finding benefits
Green Hat: creative and innovative thinking, generating new ideas
Blue Hat: strategic and overview thinking, managing the thinking process

Examples:

"We're going to put on our green hats and come up with some new marketing strategies."
"During the meeting, we used the green hat to brainstorm new product ideas."
"Let's take a break from criticism and put on our green hats to generate some fresh solutions."