NOVELTY - Generating hydrogen and syngas by biomimetic carbonation and photocatalysis, involves: accelerating hydration rate of carbon dioxide in the presence of an enzyme to obtain bicarbonates and hydrogen ions; reducing hydrogen ions optionally in the presence of a photocatalyst and/or metal and sacrificial donor optionally along with a co-catalyst under illumination or without illumination to obtain hydrogen; reducing bicarbonates to carbon monoxide in the presence of a photocatalyst and optionally using metal and the sacrificial donor; and mixing carbon monoxide with hydrogen.    USE - For generating hydrogen and syngas; and for converting carbon dioxide into syngas (all claimed) used for the synthesis of methanol, useful in fuel cells for automotive applications, in stationary sources and for electronic items and also for the synthesis of chemicals including dimethyl carbonate, dimethyl ether and diesel.    ADVANTAGE - The process produces hydrogen in a yield of 0.015- 6684.57 mu moles/4h, and the yield of hydrogen in syngas is 0.049- 17.0303 mu moles/4h, and yield of carbon monoxide (CO) in syngas is 0.0042-19.84 mu moles/4h. The process is an environmentally friendly process, and it provides a major breakthrough in the area of generation of solar hydrogen by coupling biomimetic carbonation with photocatalysis. This approach provides a revolutionary technical advancement required for hydrogen economy demanding carbon neutral hydrogen production. It also provides a major breakthrough in the area of generation of solar chemicals like formic acid, methane, methanol and syngas by coupling biomimetic carbonation with photocatalysis. This approach provides a revolutionary technical advancement required for green chemical and fuel demanding carbon neutral hydrogen production. Moreover, the process is simple, cost effective, and clean process for generating hydrogen and organic building blocks/chemicals with simultaneous control of CO2 emission. Also the production of hydrogen in addition to carbonates as end products during biomimetic carbonation make the process commercially viable to be adopted by industries emitting carbon dioxide. Also, converting carbonate rich stream photocatalytically to formic acid opens new horizons in the area of carbon sequestration by virtue of the fact that end product of carbon sequestration is not only environmentally benign but it leads to the generation of clean energy and organic building block. The process allows: conversion of proton from biomimetic carbonation reaction to high value added product like hydrogen by usage of photocatalyst like titania and co-catalyst like platinum which dispenses the need of donors like zinc which are consumed in the reaction; conversion of proton from biomimetic carbonation reaction to high value added product like hydrogen by usage of metal donors like zinc as reusable catalyst and co-catalyst like platinum under illumination which dispenses the need of replenishment of donors like zinc which are consumed in the reaction; prevention of backward hydration reaction of CO2 by converting proton to hydrogen and thus driving the reaction forward; obviates the need for the usage of buffer to maintain the pH of the reaction by converting proton to hydrogen; generation of hydrogen from purely aqueous medium thus eliminates the need to use sacrificial donors which needs to be replenished; simultaneous conversion of bicarbonate to carbon monoxide and reduction of hydrogen ion to high value added product like methane by usage of photocatalyst like titania and co-catalyst like platinum which dispenses the need of donors like zinc; conversion of bicarbonate to high value added product like formic acid by usage of photocatalyst like titania and co-catalyst like platinum which dispenses the need of donors like zinc which are consumed in the reaction; and conversion of bicarbonate and hydrogen ion to high value added product like syngas enzymatically by usage of photocatalyst like titania and co-catalyst like platinum which dispenses the need of donors like zinc which are consumed in the reaction.    DETAILED DESCRIPTION - Generating hydrogen and syngas by biomimetic carbonation and photocatalysis, involves: a) accelerating hydration rate of carbon dioxide (CO2) in the presence of an enzyme by bubbling CO2 (gas) in to water under a pressure of 2-4 bar for 45-60 minutes followed by closing the vessel and adding an enzyme dissolved in tris-buffer to obtain bicarbonates and hydrogen ions; b) reducing the hydrogen ions obtained in step (a) optionally in the presence of a photocatalyst and/or metal and sacrificial donor as donor singly or in combination optionally along with a co-catalyst under illumination or without illumination to obtain hydrogen; c) reducing the bicarbonates from step (a) to carbon monoxide in the presence of photocatalyst and optionally using metal and the sacrificial donor as donor singly or in combination; and d) mixing the carbon monoxide obtained in step (c) with hydrogen obtained in step (b) to form syngas.