Greenhouse effect and global warming

Greenhouse effect and global warming are two consequences of the destruction of the rainforests. There is a lot of information about these phenomena, but… do we know what they are? Is there any difference between the greenhouse effect and the global warming?

Watch this video and take notes. You will be asked to do a mind map with the most important words and concepts of the greenhouse effect.

Formal letter

Rules for Writing Formal Letters

In English there are a number of conventions that should be used when writing a formal letter. Furthermore, you try to write as simply and as clearly as possible, and not to make the letter longer than necessary. Remember not to use informal language like contractions.

1) Your Address
The return address should be written in the top right-hand corner of the letter.

2) The Address of the person you are writing to
The inside address should be written on the left, starting below your address.


Different people put the date on different sides of the page. You can write this on the right or the left on the line after the address you are writing to. Write the month as a word.

Salutation or greeting:

1) Dear Sir or Madam,
If you do not know the name of the person you are writing to, use this.

2) Dear Mr Jenkins,
If you know the name, use the title (Mr, Mrs, Miss or Ms, Dr, etc.) and the surname only. If you are writing to a woman and do not know if she uses Mrs or Miss, you can use Ms, which is for married and single women.

Ending a letter:

1) Yours faithfully
If you do not know the name of the person, end the letter this way.

2) Yours sincerely
If you know the name of the person, end the letter this way.

3) Your signature
Sign your name, then print it underneath the signature.

Content of a Formal Letter

First paragraph
The first paragraph should be short and state the purpose of the letter- to make an enquiry, complain, request something, etc.

The paragraph or paragraphs in the middle of the letter should contain the relevant information behind the writing of the letter. Most letters in English are not very long, so keep the information to the essentials and concentrate on organising it in a clear and logical manner rather than expanding too much.

Last Paragraph
The last paragraph of a formal letter should state what action you expect the recipient to take- to refund, send you information, etc.

Sample 1

Sample 2: