Abstract. The article is devoted to the problems of Eco-Architecture at present. It is noted that natural resources should be used to protect the health of the people. The ecological principles of architectural design are presented.

Key words: ecological architecture, natural forms, to protect the health, pollution of the environment, natural resources, ecological principles, architectural design.

Summary: The typological differences of British and American English variants of a business letter were investigated.

Key words: English business letter, British and American variants.