The production and processing of wood uses much less energy – known as embodied energy – than most other building materials, giving wood products a significantly lower carbon footprint. As a result wood can be used as a low-emission substitute for materials that require larger amounts of fossil fuels to be produced. As a rule of thumb, if you convert one cubic metre of a solid material, such as concrete or brick, for a cubic metre of timber, you will eliminate approximately one tonne (1000kg) of carbon dioxide from being emitted into the atmosphere.
Breast cancer and colon cancer are the ones that appear most related to lack of physical activity. A study from 2011 reported that 43,000 cases of colon cancer and 49,000 cases of breast cancer annually are caused by prolonged sitting . Though the cases weren't as conclusive, the same study reported that ovarian, prostate, lung, and endometrial cancer also showed a strong connection to prolonged sitting. There is not a definitive answer as to why sitting appears to cause these types of cancer, but it's possible that increases in C-reactive protein, found in people who sit for long periods of time, is the culprit.
As well as using proper separation of data and formatting making your code more efficient and more readable on-screen, using markup properly will not only signify visually that information is of a certain type, but will again benefit assistive technology users. For example if you have a list of information simply marked up as paragraphs, to someone who couldn't see the page there's no way of signifying that the information is related, whereas if your information is marked up as say and unordered list <ul> or an ordered list <ol> , visually it's easier for someone to read that information because it's clearly indented or has bullet points. For screen-reader users for example, when it comes to a list, the screen-reader will announce that the forthcoming content is a list.