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 you have a pregnancy-related illness or absence in the last four weeks of your pregnancy. 2  In this case you must inform your employer that you have an illness that relates to the pregnancy and they can insist that you start your maternity leave even if you are off sick for only one day.s long as it does not fall more than 11 weeks before your baby is due, it is generally up to you when your maternity leave begins. You can even choose to work right up to the date the baby is born. You should note that the start of your maternity leave might be triggered automatically if: