The design must also countenance increasing concerns with environmental sustainability. The architect may introduce (intentionally or not), to greater or lesser degrees, aspects of mathematics and architecture, new or current architectural theory, or references to architectural history. A key part of the design is that the architect often consults with engineers, surveyors and other specialists throughout the design, ensuring that aspects such as the structural supports and air conditioning elements are coordinated in the scheme as a whole. The control and planning of construction costs are also a part of these consultations. Coordination of the different aspects involves a high degree of specialized communication, including advanced computer technology such as BIM (Building Information Modeling), CAD, and cloud-based technologies. At all times in the design, the architect reports back to the client who may have reservations or recommendations, introducing a further variable into the design. Architects deal with local and federal jurisdictions about regulations and building codes. The architect might need to comply with local planning and zoning laws, such as required setbacks, height limitations, parking requirements, transparency requirements (windows), and land use. Some established jurisdictions require adherence to design and historic preservation guidelines. Health and safety risks form a vital part of the current design, and in many jurisdictions, design reports and records are required which include ongoing considerations such as materials and contaminants, waste management and recycling, traffic control and fire safety. Previously, architects employed drawings to illustrate and generate design proposals. While conceptual sketches are still widely used by architects, computer technology has now become the industry standard. However, design may include the use of photos, collages, prints, linocuts, 3D scanning technology and other media in design production. Increasingly, computer software such as BIM is shaping how architects work. BIM technology allows for the creation of a virtual building that serves as an information database for the sharing of design and building information throughout the life-cycle of the building's design, construction and maintenance. As current buildings are now known to be high emitters of carbon into the atmosphere, increasing controls are being placed on buildings and associated technology to reduce emissions, increase energy efficiency, and make use of renewable energy sources. Renewable energy sources may be developed within the proposed building or via local or national renewable energy providers. As a result, the architect is required to remain abreast of current regulations that are continually tightening. Some new developments exhibit extremely low energy use. However, the architect is also increasingly required to provide initiatives in a wider environmental sense, such as making provision for low-energy transport, natural daylighting instead of artificial lighting, natural ventilation instead of air conditioning, pollution, and waste management, use of recycled materials and employment of materials which can be easily recycled in the future.