it means: The world has too many people. All these people will be the reason the cities become places with no air, no space and that they will use up all resources, like food.

it is probably meant as a comment about the strangeness or different ways of another race or culture. Funny has more than one meaning in English. it can be funny: to make you laugh, or funny: to be strange/different.

1. I've got to become faster at work. better: 2. I've got to become more efficient at work. 3. I have to become faster at doing my work.

the vertabrae are individual bones that are part of the spine. the spine is made up of vertabrae and spinal nerves, the spinal cord.

If you can help me with Spanish,  then i can help you with English.

I have some doubt if i made a sentence with the same meaning to the original one.

At 87, she is the oldest surviving actor to have worked with Charles Chaplin.
She is the oldest survingving actor with 87 years old among those who have worked with Charles Chaplin.

She is the oldest surviving actor, at 87 years old, among those who worked with Charles Chaplin.

The second sentence is what i invented so please tell me if two sentences mean the same or not.
Thanks.

the second sentence is not too well structured. 

iets onlangs

Die vakansies gaan gou-gou verby, en ek moet self na my studies teruggooi terugkeer. Julle kan sien dat ek Japanees as een van my aangeleerde tale bygevoeg het. Dis nie dat ek aandag wil vestig nie. Dis aangaande 'n groot plan van my gesin. Ons het beplan om na Europa te verhuis en dit beteken dat ons binne jare ons huis in Beijing sal verlaat. Al vat dit ten minste 5 jaar, is dit nogtans 'n belangrike besluit vir ons almal. Ek voel gelukkig omdat ek altyd van Europa hou en dit is 'n groot kans vir my om 'n nuwe lewe en loopbaan hier te ontwikkel. Maar wat het dit met Japanees te doen? Dis want omdat ek is bang dat as ek my huis verlaat, sal ek my identiteit verloor as die seun van my eie ouens ouers. En die unieke feit is dat hulle Japanees praat, wat baie verskillend is van meeste Sjinese. So ek glo dat ek ook nie dieselfde soos my huisgenote (the word means housemates, is that what you meant?) wil word nie. so Ek het besluit om Japanees by te voeg as een van my "taallys" om later aan te leer. Maar wat interessant is, is ek wil nie he dat my toekomstige kinders ook Japanees moet aanleer nie. Hoekom? Bly dat jul vra. Omdat my uniekheid Afrikaans is! :D