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.
Maternity leave and pay. A pregnant employee has the right to both 26 weeks of ordinary maternity leave as well as 26 weeks of additional maternity leave. To qualify for maternity leave, an employee must tell their employer by the end of the 15th weeks before the expected week of childbirth: 1  that she is pregnant. Pregnant employees have the right to 52 weeks maternity leave. 2  39 weeks could be paid which may be statutory maternity pay, maternity allowance or contractual maternity pay (contractual pay may be more than statutory pay or could be paid for longer than 39 week-this will depend on the terms of employment).