The preliminary title contains the general provisions of the law, relating to the object and its guiding principles. Title I includes the minimum national objectives for the reduction of greenhouse gas emissions, renewable energies and energy efficiency of the Spanish economy for the years 2030 and 2050: the emissions of the Spanish economy as a whole in the year 2030 must be reduced by, at least 23% compared to 1990 and climate neutrality must be achieved no later than 2050. In addition, in 2030 a penetration of energies from renewable sources in final energy consumption must be at least, 42%, an electricity system with at least 74% generation from renewable sources and improve energy efficiency by reducing primary energy consumption by at least 39.5% with respect to the baseline according to community regulations. These objectives, in addition, will be reviewable, without implying a decrease in the level of environmental ambition and must reflect the greatest possible ambition. The goal of reducing greenhouse gas emissions by 2030 that is proposed for the Spanish economy as a whole is consistent with the increased ambition set by the European Council on December 10 and 11, 2020, which agreed on a goal to 2030 reduction of emissions in the European Union of at least 55% compared to 1990 levels, as an emission reduction path to achieve climate neutrality in the Union in 2050, in line with the Paris objectives. In this context, Spain, aware of the need to increase European ambition, prior to this agreement reinforced its commitments in greenhouse gas emissions, renewable energy and energy efficiency in the PNIEC 2021-2030 with which it materializes achieving the objectives of this law. The PNIEC responds to the path that will ensure the best way from the environmental and socioeconomic point of view to achieve the full decarbonization of Spain in 2050. The objective established for 2030 implies a 39% decrease in diffuse emissions compared to 1990, according to the evaluation of the European Commission on the PNIEC of Spain, surpassing by 13 points the goal set for these same sectors in the European Regulation on the distribution of efforts in force at that time. The commitment to move forward and advance climate ambition is included in the Recovery, Transformation and Resilience Plan, which places the 