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.
This is usually the first day of your maternity leave. You do not have to be actually at work to have this choice. For example, you might be off sick. If your employment ends before the start of the 11th week before the week your baby is due, your SMP will start at that 11th week. SMP can be paid for up to 39 weeks, this is called the Maternity Pay Period (MPP). Statutory Maternity Leave.