The indicator measure the number of nights spent at establishments intended to shelter tourists. "A tourist accommodation establishment is defined as any facility that regularly or occasionally provides short-term accommodation for tourists as a paid service (although the price might be partially or fully subsidised)."

(From, http://ec.europa.eu/eurostat/documents/3859598/5925845/KS-GQ-13-007-EN.P..., accessed 06.05.2015)

Number of firms, implementing innovations with environmental benefits

The percentage of the population that meets the following three criteria, as a percentage of the total population aged 25-64, and active in the labour market (e.g. employed or unemployed by available to work): (i) aged 25-64, (ii) active in the labour market (e.g. employed or unemployed but available to work), and (iii) has successfully completed studies in science and technology (beyond secondary school education, e.g. at college, university etc.) or are employed in science and technology.

The indicator measures the total built-up area as a share of the total surface area of land in the country. Built-up areas are areas covered with buildings and greenhouses whereas non built-up areas include streets and sealed surfaces.
Retrieved from http://ec.europa.eu/eurostat/tgm/table.do?tab=table&init=1&plugin=0&lang... on 26/03/2015