Gases that contribute to the greenhouse effect include: 1  Water vapor. 2  Carbon dioxide (CO 2). 3  Methane. 4  Nitrous oxide. 5  Chlorofluorocarbons (CFCs).
You can start maternity leave any time from 11 weeks before the beginning of the week your baby's due. You can bring the date forward if you need to take time off work for pregnancy-related reasons within four weeks of the expected birth date. Your employer may make you start your leave from then.
1 All pregnant employees can take up to 52 weeksâ maternity leave around the birth of their child. 2  During statutory maternity leave, you may be entitled to statutory maternity pay for up to 39 weeks.3  You must take a minimum of two weeksâ leave after the birth of your child, or four if you work in a factory. All pregnant employees can take up to 52 weeksâ maternity leave around the birth of their child. 2  During statutory maternity leave, you may be entitled to statutory maternity pay for up to 39 weeks.