Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE Courses ( author_id VARCHAR )
TABLE: CREATE TABLE Course_Authors_and_Tutors ( address_line_1 VARCHAR, author_id VARCHAR )

### Question ###
Find the addresses and author IDs of the course authors that teach at least two courses.

### Accurate SQL ###

SELECT T1.address_line_1, T2.author_id FROM Course_Authors_and_Tutors AS T1 JOIN Courses AS T2 ON T1.author_id = T2.author_id GROUP BY T2.author_id HAVING COUNT(*) >= 2